A
- AAE-1 (cable system) - (Asia Africa Europe Gateway) (France, Italy, Greece, Egypt, Saudi Arabia, Djibouti, Yemen, Qatar, UAE, Oman, Pakistan, India, Myanmar, Cambodia, Thailand, Malaysia, Singapore, Vietnam, Hong Kong) (In Planning stage.)
- AAG - (Asia America Gateway) (Malaysia, Singapore, Thailand, Brunei, Vietnam, Hong Kong, the Philippines, Guam, Hawaii, Continental USA West Coast)
- AC-1 - (Atlantic Crossing) (USA, UK, Germany, the Netherlands)
- AC-2 - (Atlantic Crossing,, a.k.a. Yellow) (USA-UK)
- ACE - (Africa Coast to Europe) (France, Spain, Portugal, Morocco, Canary Islands (Spain), Western Sahara, Mauritania, Senegal, Gambia, Guinea, Sierra Leone, Liberia, Côte d'Ivoire, Ghana, Togo, Benin, Nigeria, Cameroon, São Tomé and Príncipe, Equatorial Guinea, Gabon, Congo, Angola, Namibia, South Africa)
- Aden-Djibouti - (Yemen-Djibouti)
- ADRIA-1 - (Croatia, Albania, Greece)
- AIS - (Australia-Indonesia-Singapore) (decommissioned)
- AJC - (Australia-Japan Cable)
- ALETAR - (Alexandria-Tarsous) (Egypt-Syria)
- Alonso de Ojeda - (Aruba-Curaçao)
- ALPAL-2 - (Algiers-Palma de Mallorca) (Algeria-Spain)
- AMERICAS-1 NORTH - (USA-US Virgin Islands)
- AMERICAS-1 SOUTH - (US Virgin Islands, Trinidad, Venezuela, Brazil)
- AMERICAS-II - (USA, Puerto Rico, US Virgin Islands, Martinique, Curaçao, Trinidad, Venezuela, French Guiana, Brazil)
- AMX-1 - (United States, Mexico, Guatemala, Colombia, Dominican Republic, Puerto Rico, Brazil)
- ANNIBAL (France-Tunisia) (decommissioned)
- ANTILLAS I - (Dominican Republic-Puerto Rico)
- Antilles Crossing Phase 1 - (US Virgin Islands, St Lucia, Barbados)
- ANZCAN - (Australia, New Zealand, Canada) (decommissioned)
- APC - (Asia-Pacific Cable) (Japan, Taiwan, Hong Kong, Malaysia, Singapore)
- APCN - (Asia-Pacific Cable Network) (Japan, Korea, Philippines, Taiwan, Hong Kong, Malaysia, Singapore, Thailand, Indonesia, Australia)
- APCN 2 - (Asia-Pacific Cable Network 2) (Japan, Korea, Philippines, Taiwan, China, Hong Kong, Malaysia, Singapore)
- APHRODITE-1 - (Greece-Cyprus) (decommissioned)
- APHRODITE-2 - (Greece-Cyprus)
- APNG - (Australia-Papua New Guinea) (decommissioned)
- APNG-2 - (Australia-Papua New Guinea)
- APG - (Asia-Pacific Gateway)[1]
- Apollo - (USA, UK, France)
- ARCOS-1 - (Americas Region Caribbean Optical-ring System) (USA, Mexico, Belize, Guatemala, Honduras, Nicaragua, Costa Rica, Panama, Colombia, Venezuela, Netherlands Antilles, Puerto Rico, Dominican Republic, Turks and Caicos Islands, Bahamas)
- it:Arctic_Fibre (italian)- (UK, Canada, USA, Japan) (planned)
- Arctic Link - (UK, Canada, USA, Japan) (planned)
- ARIANE-2 - (France-Greece)
- ASE (Asia Submarine Cable Express) - Singapore, Malaysia, Philippines, Singapore (2012)
- ASEAN - (Singapore, Philippines, Indonesia, Malaysia, Thailand) (decommissioned)
- ASH - (American Samoa, Samoa, Hawaii)
- Atlantica-1/GlobeNet - (USA, Bermuda, Venezuela, Brazil)
- ATLANTIS - (Brazil, Senegal, Portugal) (decommissioned)
- ATLANTIS-2 - (Argentina, Brazil, Senegal, Cape Verde Islands, Canary Islands, Madeira, Spain, Portugal)
- ATLAS - (Portugal, Morocco) (decommissioned)
- Atlas Offshore - (Morocco-France)
- Australia West Express (planned) - Perth - Diego Garcia - Djibouti
B
- BAHAMAS 2 - (USA-Bahamas)
- BALTICA - (Poland, Denmark, Sweden)
- Banjoewangi - Broome (Australia, Indonesia) (decommissioned)
- Barcelona - Pisa (Spain, Italy) (decommissioned)
- Barcelona - Rome (Spain, Italy) (decommissioned)
- BARGEN - (Cabrera de Mar, Barcelona-Genova) (Spain-Italy) (decommissioned)
- BARSAV - (Barcelona-Savona) (Spain-Italy)
- BCS - (Sweden, Lithuania, Latvia, Finland)
- BDSNi - (Bahamas Domestic Submarine Network international)
- BERYTAR - (Beirut-Tartous) (Syria-Lebanon)
- Bharat Lanka Cable System - (BLCS) (India-Sri Lanka)
- BICS - (Bahamas Internet Cable System)
- BMP - (Brunei, Malaysia, Philippines) (decommissioned)
- Botnia - (Sweden-Finland)
- BRCS - (Batam Rengit Cable System) (Indonesia - Malaysia)
- BS - (Brunei-Singapore) (decommissioned)
- BSCS - (Batam-Singapore Cable System) (Indonesia - Singapore)
- BSFOCS - (Black Sea Fibre Optic Cable System) (Bulgaria, Ukraine, Russia)
- BT-MT1 - (British Telecom - Manx Telecom) (UK-Isle of Man)
- BT-TE1 - (British Telecom - Telecom Éireann) (UK-Ireland)
- BUS-1 - (Bermuda-US - now a segment of GlobeNet)
- BDM - (Batam Dumai Malaka Cable System) (Indonesia - Malaysia)
- BBG - (BBG Bay of Bengal Gateway Cable System) (Barka - Fujairah - India - Sri Lanka - Malaysia - Singapore)
C
- C-J FOSC - (China-Japan Fibre Optic Submarine Cable)
- CADMOS - (Cyprus-Lebanon)
- Canal Zone - Jamaica (Panama, Jamaica) (decommissioned)
- CANTAT-1 - (Canada Transatlantic) - (Canada-UK) (decommissioned)
- CANTAT-2 - (Canada Transatlantic) - (Canada-UK) (decommissioned)
- CANTAT-3 - (Canada Transatlantic) - (Canada, Iceland, the Faeroes, UK, Denmark, Germany)
- CANUS-1 - (Canada-USA)
- CARAC - (Caribbean Atlantic Cable) (Bermuda-Tortola)
- C-Lion - (Finland - Germany) (under construction)[2]
- Cayman-Jamaica
- CELTIX CONNECT - (UK-Ireland) (planned 2010)
- CFX - (USA-Colombia)
- Challenger - (USA-Bermuda)
- CIOS - (Cyprus-Israel Optical System) (Cyprus-Israel)
- CIRCE NORTH - (UK-the Netherlands)
- CIRCE SOUTH - (UK-France)
- CKC - (China-Korea Cable) (PRC-South Korea) (decommissioned)
- CNSFTC - (Central North Sea Fibre Telecommunications Company) - (UK-North Sea oil platforms)
- Colombia-Jamaica-Florida
- COLUMBUS II - (USA-Mexico-Italy)
- COLUMBUS III - (USA-Azores-Portugal-Italy)
- Commonwealth Pacific Cable (COMPAC) (Canada, USA, Fiji, New Zealand, Australia) (decommissioned - portions in scientific use)
- Concerto 1 - (Triangular UK-Belgium-the Netherlands)
- Corfù–Bar - (Greece-Montenegro)
- CORSAR - (Corsica-Sardinia) (France-Italy)
- Cuba-Venezuela - Cuba-Venezuela
- CUCN - (China-US Cable Network) (Korea-US-China-Japan-Guam)
D
- Danica North (Denmark-Sweden)
- Danica South (Denmark-Sweden)
- DANICE - (Denmark-Iceland)
- Darwin - Banjoewangi (Australia, Indonesia) (decommissioned)
- Denmark-Norway 5
- Denmark-Norway 6
- Denmark-Poland 2
- Denmark-Russia 1
- Denmark-Sweden 15
- Denmark-Sweden 16
- Denmark-Sweden 17
- Denmark-Sweden 18
- DMCS - (Dumai-Melaka Cable System) (Indonesia-Malaysia)
- DSCS - (Dhiraagu & Sri Lanka Telecom Cable System) (Maldives-Sri Lanka)
E
- EAC-C2C - (East Asia Crossing/C2C) (Japan, South Korea, Taiwan, China, Hong Kong, Singapore, Philippines, Vietnam, Guam, USA)
- Eagle - (Japan-USA) - planned
- EASSy - (an East Africa Submarine Cable System with endpoints in South Africa and the Sudan)
- EC-1 - (Eastern Link Cable System) (Trinidad, Netherlands Antilles)
- ECFS - (Eastern Caribbean Fibre System) (Trinidad, Grenada, St Vincent, Barbados, St Lucia, Martinique, Dominica, Guadeloupe, Montserrat, Antigua, St Kitts, St Maarten, Anguilla, Tortola)
- ECSC - (Japan, China) (decommissioned - portions in scientific use)
- EDF1 (INGRID) - (Jersey, France)
- EDF2 (INGRID) - (Guernsey, Jersey, France)
- EE-S1 - (Estonia-Sweden 1) (Estonia-Sweden)
- EESF-2 - (Estonia-Finland)
- EESF-3 - (Estonia-Finland)
- EIG - (Europe India Gateway) (UK, Portugal, Gibraltar, France, Monaco, Libya, Egypt, Saudi Arabia, Djibouti, Oman, UAE, India)
- EMOS 1 - (Eastern Mediterranean Optical System) (Greece, Israel, Turkey, Italy)
- ESAT 1 - (Wexford to Cornwall)
- ESAT 2 - (Dublin to Ainsdale)
- Estepona–Tetuán - (Morocco, Spain)
- EURAFRICA - (Portugal, Morocco, France)
F
- FALCON - see FLAG FALCON below.
- FARICE-1 - (UK-Faroes-Iceland)
- FARLAND - (UK-the Netherlands)
- FASTER - (Oregon-Japan)
- FEC - (Finland Estonia Connection)
- Fehmarn Belt - (Denmark-Germany)
- Fibralink - (Jamaica-Dominican Republic)
- FLAG FA-1 - (FLAG Atlantic) (USA, UK, France)
- FLAG FALCON - (FLAG Alcatel-Lucent Optical Network) - (Bahrain, Egypt, India, Iran, Iraq, Jordan, Kenya, Kuwait, Maldives, Oman, Qatar, Saudi Arabia, Sir Lanka, Sudan, UAE, Yemen)
- FLAG FEA - (FLAG Europe-Asia) (UK, Spain, Italy, Jordan, Egypt, Saudi Arabia, United Arab Emirates, India, Malaysia, Thailand, Hong Kong, China, South Korea, Japan)
- FLAG FNAL - (FLAG North Asian Loop) (Hong Kong, Taiwan, South Korea, Japan)
- Florida-Jamaica - (USA, Jamaica) (decommissioned)
- FLAG FP-1 - (FLAG Pacific) (Japan, Canada, USA)
- FOG - (Fiber Optic Gulf) (UAE-Qatar-Bahrain-Kuwait)
- FOG2 - (Fiber Optic Gulf 2) (UAE-Iraq-Saudi Arabia)
- France-Algeria (decommissioned)
- France-Greece (decommissioned)
- France-Morocco (decommissioned)
- France-Tunisia (decommissioned)
G
- G-P - (Guam-Philippines)
- GCN - (Global Caribbean Network) (Guadeloupe, St. Martin, Ste. Croix, Puerto Rico)
- Gemini - (USA, UK, Bermuda)
- Georgia-Russia
- Germany-Denmark 1 (decommissioned)
- Germany-Denmark 2
- Germany-Sweden 4 (decommissioned)
- Germany-Sweden 5 (decommissioned)
- GLO-1 - (Globacom-1) (Nigeria, Ghana, Senegal, Mauritania, Morocco, Portugal, Spain, UK) (planned)
- GO-1 - (Italy-Malta)
- Gondwana-1 - (New Caledonia, Australia)
- Gotland-Ventspils - (Sweden-Latvia)
- GPT - (Guam-Philippines-Taiwan) (decommissioned)
- Greenland Connect - (Canada-Greenland-Iceland)
- Gulf Bridge International - (Linking the GCC countries (Bahrain, Iran, Iraq, the Kingdom of Saudi Arabia, Kuwait, Oman, Qatar and the UAE) to each other and onwards to Europe, Africa and Asia) - (planned for 2012)
- GWEN - (Greece to Western Europe Network) (Italy - Greece)
H
- Haiwaiki - (New Zealand, Australia, American Samoa, Hawaii, Pacific City) - under construction
- HANNIBAL - (Tunisia-Italy)
- HANTRU-1 - (Guam - Pohnpei (FSM) - Majuro (Marshall Islands) - Kwajalein)
- Hawk - (France-Tunisia-Libya-Italy-Turkey-Cyprus-Syria-Egypt) - planned
- HERMES-1 - (UK-Belgium)
- HERMES-2 - (UK-Netherlands)
- Hibernia Atlantic - (UK, Ireland, Canada, USA)
- HJK - (Hong Kong-Japan-Korea) (decommissioned)
- Honotua - (Tahiti-Hawaii)[3][4]
- HONTAI-2 - (Hong Kong-Taiwan) (decommissioned)
- HSCS - (Hokkaido-Sakhalin Cable System) (Russia - Japan)[5]
- HUGO - (High capacity, Undersea Guernsey Optical-fibre) (UK, Guernsey, France)
- HUGO East - (High capacity, Undersea Guernsey Optical-fibre) (France, Jersey, Guernsey)
I
- I-ME-WE - (India-Middle East-Western Europe) (India, Pakistan, UAE, Saudi Arabia, Egypt, the Lebanon, Italy, France)
- i2i - (India-Singapore)
- India-UAE
- IOCOM - (India-Malaysia) (decommissioned)
- Ir-UK Seg A - (Ireland-UK)
- Ir-UK Seg B - (Ireland-UK)
- Italy-Albania
- Italy-Croatia
- Italy-Greece
- Italy-Libya
- Italy-Malta
- Italy-Monaco
- Italy-Tunisia
- ITUR - (Italy-Turkey-Ukraine-Russia)
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J
- Japan-US
- JAKABARE - (Java - Kalimantan - Batam - Singapore) (Indonesia-Singapore)
- JASURAUS - (Jakarta - Surabaya - Australia) (Indonesia-Australia)
- Jersey-Guernsey 4
- JKC - (Japan-Korea) (decommissioned - portions in scientific use)
- JNAC - (USA, Japan, China, South Korea, Taiwan) (planned, but not built)
- JONAH (Bezeq International Optical System) – (Israel, Cyprus, Italy)
K
- KAFOS - (Karadeniz Fiber Optik Sistemi) (Turkey, Bulgaria, Romania)
- KATTEGAT-1 - (Denmark-Sweden)
- KATTEGAT-2 - (Denmark-Sweden)
- KELTRA-2 - (Kelibia-Trapani) (Tunisia-Italy)
- Key West-Havana 5 (USA, Cuba) (decommissioned - portions in scientific use)
- Key West-Havana 6 (USA, Cuba) (decommissioned - portions in scientific use)
- KDN-Reliance - (Yemen - Kenya) (planned for 2007)
- KJCN - (Korea-Japan Cable Network)
- Kuwait-Iran
L
- La Perouse-Nelson - (Australia, New Zealand) (decommissioned)
- La Perouse-Wakapauka - (Australia, New Zealand) (decommissioned)
- LANIS-1 - (Isle of Man-UK)
- LANIS-2 - (Northern Ireland (UK) -Isle of Man)
- LANIS-3 - (Northern Ireland-Scotland)
- LEV - (Italy, Cyprus, Israel)
- Liberty - (UK, Guernsey, Jersey, France)
- LION - (Lower Indian Ocean Network) (Madagascar, Reunion, Mauritius)[6]
- LV-SE 1 - (Latvia-Sweden)
- LSP - (Libya-Crete, Greece)
M
- MAC - (Mid-Atlantic Crossing) (USA, St. Croix)
- Main One - (Portugal, Ghana, Nigeria, South Africa) (planned)
- SLT-Dhiraagu Cable System Maldives-Sri Lanka
- Malaysia-Thailand
- Marseille-Palermo - (France-Italy)
- MARTEL (Marseille - Tel Aviv) (decommissioned)
- MAT-2 - (Italy-Spain)
- MAYA-1 - (USA, Mexico, Cayman Islands, Honduras, Costa Rica, Panama, Colombia)
- MCN - (Mid-Caribbean Network) (Guadeloupe, Dominica, Martinique)
- MCS - (Matrix Cable System) (Indonesia-Singapore)
- MedNautilus - (Italy, Greece, Turkey, Israel, Cyprus)
- MED Cable - (France-Algeria)
- MENA - (Middle East North Africa) (Italy, Greece, Egypt, Saudi Arabia, Oman)
- MIC-1 - (Moratel International Cable 1) (Batam, Singapore)
- Micronesia Cable System -
- MINERVA - (Cyprus-Italy)
- Monet (submarine cable)
- MOYLE NORTH - (Northern Ireland-Scotland)
- MOYLE SOUTH - (Northern Ireland-Scotland)
- MT - (Malaysia-Thailand)
- MTC - (Guam, Marianas Islands)
N
- NACS - (North Asia Cable System) (Hong Kong, Taiwan, Japan)
- NAFSIKA - (Italy-Greece)
- New Jersey-Bermuda - (USA, Bermuda) (decommissioned)
- New Zealand-Fiji - (decommissioned)
- NorSea Com 1 - (Norway-UK)
- NPC - (North Pacific Cable) - (USA, Japan) (decommissioned)
O
- ODIN - (the Netherlands, Denmark, Norway) (portions decommissioned)
- Okinawa-Luzon-Hong Kong - (Hong Kong, the Philippines, Japan) (decommissioned - portions in scientific use)
- Otranto-Corfù - (Italy-Greece)
P
- PAC - (Pan-American Crossing) (California, Mexico, Panama, Venezuela, and the Caribbean)[7]
- PacRimEast - (Pacific Rim East) (New Zealand-Hawaii)
- PacRimWest - (Pacific Rim West) (Australia-Guam) (decommissioned)
- Pakistan-UAE-2
- PAN AM - (Pan-American Cable System)
- Pangea - (UK-Denmark & UK-the Netherlands)
- Pangea (Baltic Sea) - (Sweden, Estonia, Finland)
- PC-1 - (Pacific Crossing) (California, Washington and Japan)[7]
- PEC - (Pan-European Crossing)
- PPC-1 - (Pipe Pacific Cable)(Australia, Papua New Guinea, Guam)
- Portugal-UK - (decommissioned)
- Project Express - (Hibernia Atlantic's Project Express)(Canada-UK)[8]
- PTAT-1 - (Private Trans-Atlantic Telecommunications System) (USA-UK)
Q
R
- REMBRANDT-1 - (UK-the Netherlands)
- REMBRANDT-2 - (UK-the Netherlands)
- RIOJA-1 - (UK-Spain) (decommissioned)
- RIOJA-2 - (UK-Belgium) (decommissioned)
- RIOJA-3 - (Belgium-the Netherlands) (decommissioned)
- RJCN - (Russia-Japan Cable Network) (Russia, Japan)
- RJK - (Russia-Japan-Korea)
- RNAL - (Reach North Asia Loop) (Hong Kong-Taiwan-Japan, Hong Kong-Korea-Japan)
- Russian Optical Trans-Arctic Submarine Cable System (ROTACS) - (UK, Russia, China, Japan) (planned)
S
- SAC - (South American Crossing)
- SAFE - (South Africa-Far East) (South Africa, Mauritius, India, Malaysia)
- SAm-1 - (South America-1)
- SAS - (Samoa-American Samoa)
- SAS-1 - (Saudi Arabia-Sudan)
- SAT-1 - (South Atlantic) (South Africa, Ascension (UK), Cape Verde, Spain, Portugal) (decommissioned)
- SAT-2 - (South Atlantic) (South Africa, Spain, Portugal)
- SAT-3/WASC - (South Atlantic 3/West Africa Submarine Cable) (Portugal, Spain, Senegal, Côte d'Ivoire, Ghana, Benin, Nigeria, Cameroon, Gabon, Angola, South Africa)
- SCAN - (Submarine Cable Asia Network) (Indonesia, Hong Kong) - planned
- Scandinavian Ring
- SCF - (Southern Caribbean Fiber) (St Kitts, Martinique, St Lucia, St Vincent and the Grenadines, Grenada, Trinidad and Tobago, Barbados, Guadeloupe, Antigua)
- SEA-ME-WE 1 – (South East Asia-Middle East-Western Europe) (decommissioned)
- SEA-ME-WE 2 – (South East Asia-Middle East-Western Europe) (decommissioned)
- SEA-ME-WE 3 – (South East Asia-Middle East-Western Europe)
- SEA-ME-WE 4 – (South East Asia-Middle East-Western Europe)
- SEA-ME-WE 5 – (South East Asia-Middle East-Western Europe)
- Seabras-1 - (USA-Brazil) (planned)
- SEACOM - (Singapore-Jesselton(Kota Kinabalu)-Hong Kong-Guam-Madang-Cairns) (decommissioned)
- SEACOM - (South Africa, Madagascar, Mozambique, Tanzania, Kenya, India and Europe)
- SF-S5 - (Sweden-Finland) (decommissioned)
- SFL - (Sweden-Finland Link)
- SFS-4 - (Sweden-Finland)
- SG-SCS - (Suriname-Guyana Submarine Cable System) (Trinidad-Guyana-Suriname)
- SHEFA-2 - (Shetland-Faroes) (UK-Faroes)
- SIRIUS NORTH - (Northern Ireland-Scotland)
- SIRIUS SOUTH - (Ireland-England)
- SJC - (Indonesia, Singapore, Malaysia, Thailand, the Philippines, Hong Kong, China, Japan) - planned
- SMPR-1 - (St. Maarten-Puerto Rico)
- SOLAS - (Ireland-UK)
- Southern Cross - (Australia, New Zealand, Fiji, United States)
T
- T-V-H - (Thailand-Vietnam-Hong Kong)
- TAGIDE-2 - (France-Portugal) (decommissioned)
- TAIGU - (Taiwan-Guam) (decommissioned)
- TAILU - (Taiwan-Luzon) (decommissioned)
- TAINO CARIB - (Puerto Rico, US Virgin Islands, British Virgin Islands)
- TampNett - (Norway-North Sea Oil Platforms)
- Tangerine - (UK-Belgium)
- TASMAN 1 - (Australia-New Zealand) (decommissioned)
- TASMAN 2 - (Australia-New Zealand)
- TAT-1 - (UK-Canada) (decommissioned)
- TAT-2 - (France-Canada) (decommissioned)
- TAT-3 - (UK-USA) (decommissioned)
- TAT-4 - (France-USA) (decommissioned)
- TAT-5 - (Spain-USA) (decommissioned)
- TAT-6 - (France-USA) (decommissioned)
- TAT-7 - (UK-USA) (decommissioned)
- TAT-8 - (USA, UK, France) (decommissioned)
- TAT-9 - (USA, Canada, Spain) (decommissioned)
- TAT-10 - (Germany-USA) (decommissioned)
- TAT-11 - (USA, France, UK) (decommissioned)
- TAT-12/13 - (USA, UK, France)
- TAT-14 - (USA, UK, France, the Netherlands, Germany, Denmark)
- TBL - (Trans-Balkan Line) (Italy-Albania, continuing overland through Macedonia, Bulgaria, and into Turkey)
- TCCN - (Trans Caribbean Cable Network) - (USA-Jamaica)
- TCS-1 - (Trans-Caribbean System 1) (decommissioned)
- TE North - (Telecom Egypt North) (France-Egypt)
- TEAMS - (The East African Marine System) (UAE-Kenya)
- Telstra Endeavour - (Sydney-Hawaii)
- TIC or TIISCS - (Tata Indicom Cable) or (Tata Indicom India-Singapore Cable System) (India-Singapore)
- TIS - (Thailand-Indonesia-Singapore)
- TPC-1/TRANSPAC-1 - (Trans Pacific Cable) - (Vietnam, Hong Kong, the Philippines, Japan, Guam, Hawaii) (decommissioned - portions in scientific use)
- TPC-2/TRANSPAC-2 - (Trans Pacific Cable) - (Singapore, Hong Kong, South Korea, Taiwan, Guam) (decommissioned - portions in scientific use)
- TPC-3/TRANSPAC-3 - (Trans Pacific Cable) (decommissioned)
- TPC-4 - (Trans Pacific Cable) (decommissioned)
- TPC-5CN - (Trans Pacific Cable) - (Japan, Guam, Hawaii, USA)
- TPE - (Trans-Pacific Express) (China, Korea, Taiwan, USA)
- TPE2 - (Trans-Pacific Express) (China, Korea, Taiwan, USA, Japan)
- TPICK (Telecommunication Plan for Improvement of Communications in Korea) - runs the length of Korea to mainland Japan via Changson-Tsushima-Seburiyama
- Trinidad-Curacao
- TSE-1 (Taiwan Strait Express 1) (First cable directly connecting Taiwan and mainland China)
- TWA-1 (Transworld Associates) (UAE-Oman-Pakistan)
U
- UGARIT - (Cyprus-Syria)
- UK-Belgium 5 (decommissioned)
- UK-Belgium 6 (decommissioned)
- UK-Channel Isles 7
- UK-Channel Isles 8
- UK-Denmark 4 (decommissioned)
- UK-France 3
- UK-France 4 (decommissioned)
- UK-Germany 5
- UK-Germany 6
- UK-Netherlands 12 (decommissioned)
- UK-Netherlands 14
- UK-Spain 4 (decommissioned)
- ULYSSES-1 - (UK-France)
- ULYSSES-2 - (UK-the Netherlands)
- UNISUR - (Argentina, Uruguay, Brazil)
- UNITY - (Japan-USA)
V
W
- WACS - (West Africa Cable System) (South Africa, Namibia, Angola, the Democratic Republic of the Congo, the Republic of Congo, Cameroon, Nigeria, Togo, Ghana, Côte d'Ivoire, Cape Verde, Canary Islands, Portugal, United Kingdom)
- WAFS - (West Africa Festoon System)
- WASC - (West Africa Submarine Cable)
Y
Z
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