Cable ops · South Atlantic Ocean 20 116.3 5 34 0.6× / 34.4 Nav aids · Inner Seas off the West Coast of Scotland surge long running 14 81.8 4 674 5.0× / 2.8 Incidents · North Pacific Ocean surge 11 114.9 9 71 2.5× / 4.4 Exercises · Arabian Sea new 10 57.6 0 — new / 0 Exercises · North Atlantic Ocean surge 10 46.9 1 39 2.2× / 4.6 Nav aids · South Atlantic Ocean surge long running 9 252.9 11 406 2.6× / 3.4 Nav aids · North Sea long running 8 191.5 8 525 1.3× / 6.4 Exercises · North Pacific Ocean 8 51.2 1 32 1.4× / 5.6 Cable ops · Mediterranean Sea - Eastern Basin surge 6 63.2 3 48 6.0× / 1 Exercises · Laccadive Sea new 6 26.2 1 22 new / 0 Incidents · South Pacific Ocean 5 121.1 4 68 1.5× / 3.4 Missiles · North Pacific Ocean 5 56 2 31 1.7× / 3 Quakes · Bismarck Sea surge 5 17 0 — 13× / 0.4 Incidents · South Atlantic Ocean surge 5 16.2 2 71 2.3× / 2.2 Cable ops · Indian Ocean surge 5 10.1 0 — 13× / 0.4 Derelicts · South Atlantic Ocean surge 5 9.7 0 — 13× / 0.4 Exercises · Ligurian Sea surge 5 8.9 0 — 4.2× / 1.2 Incidents · Philippine Sea surge 4 115.1 5 65 4.0× / 1 Nav aids · English Channel long running 4 91.2 3 500 1.1× / 3.8 Exercises · Aegean Sea 4 89.8 3 61 1.2× / 3.4 Incidents · South China Sea surge 4 68.7 3 75 2.2× / 1.8 Cable ops · North Atlantic Ocean 4 63 2 42 0.7× / 6.2 Incidents · Indian Ocean surge 4 52.2 3 55 4.0× / 1 Other · South Atlantic Ocean surge 4 46.2 1 359 20× / 0.2 Incidents · Coral Sea surge 4 27 1 72 3.3× / 1.2 Surveys · Mediterranean Sea - Eastern Basin surge 4 24.9 1 18 20× / 0.2 Incidents · North Atlantic Ocean 4 22.5 0 — 1.5× / 2.6 Surveys · Tyrrhenian Sea surge 4 12.7 0 — 20× / 0.2 Exercises · Arctic Ocean new 4 11.5 2 5 new / 0 Nav aids · South Pacific Ocean long running 3 119.6 5 505 1.7× / 1.8 Nav aids · North Atlantic Ocean surge long running 3 73.9 4 551 3.0× / 1 Derelicts · South Pacific Ocean surge 3 61.9 3 36 5.0× / 0.6 Cable ops · Arabian Sea surge 3 42.4 2 22 5.0× / 0.6 Surveys · North Atlantic Ocean surge 3 38.4 1 23 2.5× / 1.2 Exercises · Mediterranean Sea - Eastern Basin surge 3 36.5 0 — 3.8× / 0.8 Surveys · South Atlantic Ocean new 3 36.5 1 36 new / 0 Containers · South Atlantic Ocean surge 3 19.9 0 — 15× / 0.2 Exercises · Bay of Bengal surge 3 16.7 1 15 7.5× / 0.4 Quakes · North Pacific Ocean 3 9 0 — 0.6× / 4.8 Quakes · Solomon Sea 3 8.5 1 29 1.1× / 2.8 Containers · English Channel surge 3 7.9 0 — 15× / 0.2 Incidents · Aegean Sea new 3 4.2 1 3 new / 0 Other · North Pacific Ocean surge 3 3.7 1 3 3.8× / 0.8 Nav aids · Gulf of Mexico new 3 2.3 0 — new / 0 Wrecks · South China Sea 2 111.9 4 154 10× / 0.2 Other · Japan Sea 2 60.2 2 31 3.3× / 0.6 War risk · Persian Gulf long running 2 56 2 392 1.7× / 1.2 Cable ops · Persian Gulf new 2 43.4 1 102 new / 0 Exercises · Tyrrhenian Sea 2 30 1 30 1.1× / 1.8 Cable ops · Bay of Bengal 2 29.6 1 21 10× / 0.2 Icebergs · Southern Ocean 2 23.7 0 — 5.0× / 0.4 Exercises · Mediterranean Sea - Western Basin 2 15.8 0 — 1.0× / 2 Containers · Celtic Sea 2 12.1 0 — 10× / 0.2 Surveys · Ligurian Sea 2 11 0 — 5.0× / 0.4 Towing · Mediterranean Sea - Eastern Basin new 2 8.8 1 10 new / 0 Quakes · South Pacific Ocean 2 8.7 0 — 0.3× / 6.8 Containers · Ligurian Sea new 2 7.4 1 7 new / 0 Cable ops · North Sea 2 6.1 1 12 0.7× / 2.8 Quakes · Philippine Sea 2 6 0 — 0.8× / 2.6 Quakes · South Atlantic Ocean 2 6 0 — 10× / 0.2 Nav aids · Coral Sea long running 1 142.8 5 679 0.3× / 3.2 Nav aids · Celtic Sea 1 83.1 3 324 0.4× / 2.6 Nav aids · Irish Sea and St. George's Channel long running 1 82.2 3 666 0.5× / 2.2 Incidents · Mediterranean Sea - Eastern Basin 1 78.1 2 49 2.5× / 0.4 Nav aids · Gulf of Suez 1 70.3 3 182 new / 0 Nav aids · North Pacific Ocean 1 57.9 2 363 new / 0 Incidents · Arabian Sea 1 49.3 2 40 1.7× / 0.6 Nav aids · Tyrrhenian Sea 1 42.9 1 310 1.0× / 1 Nav aids · Great Australian Bight 1 42.6 2 315 1.3× / 0.8 Exercises · Malacca Strait 1 32.3 1 32 5.0× / 0.2 Other · Yellow Sea 1 30 1 33 2.5× / 0.4 Other · North Sea long running 1 28.9 1 696 2.5× / 0.4 Ordnance · Ligurian Sea 1 28 1 33 new / 0 Cable ops · Eastern China Sea 1 24.3 1 24 2.5× / 0.4 Incidents · Ionian Sea 1 21.4 1 21 new / 0 Cable ops · Philippine Sea 1 18.6 0 — new / 0 Cable ops · South China Sea 1 18 1 43 1.0× / 1 Other · North Atlantic Ocean 1 16.9 1 16 5.0× / 0.2 Cable ops · Black Sea 1 16.7 1 16 new / 0 Other · Sea of Marmara 1 16.4 1 16 new / 0 Piracy · Indian Ocean 1 15.8 0 — new / 0 Cable ops · Mozambique Channel 1 15.1 1 15 new / 0 Other · Gulf of Suez 1 14.3 1 14 new / 0 Nav aids · Bass Strait 1 14.1 0 — 1.0× / 1 Spills · Caribbean Sea 1 14 0 — 5.0× / 0.2 Surveys · Inner Seas off the West Coast of Scotland 1 12.8 0 — 0.6× / 1.8 Spills · Gulf of Mexico 1 10 1 10 0.3× / 3 Cable ops · Celtic Sea 1 9.6 0 — 0.5× / 2 Cable ops · Laccadive Sea 1 8.5 1 8 new / 0 Cable ops · North Pacific Ocean 1 8.5 0 — 0.6× / 1.6 Other · Tyrrhenian Sea 1 8.5 0 — 1.0× / 1 Cable ops · Mediterranean Sea - Western Basin 1 8.3 0 — 2.5× / 0.4 Debris · Philippine Sea 1 6.7 0 — new / 0 Icebergs · Indian Ocean 1 6.5 0 — new / 0 Debris · English Channel 1 6.4 0 — new / 0 Containers · Bay of Biscay 1 6.3 0 — new / 0 Derelicts · Gulf of Thailand 1 5.9 0 — new / 0 Derelicts · South China Sea 1 5.9 0 — 2.5× / 0.4 Exercises · Philippine Sea 1 5.8 0 — new / 0 Incidents · Ligurian Sea 1 5.6 1 5 new / 0 Cable ops · Adriatic Sea 1 5.5 0 — 5.0× / 0.2 Exercises · Adriatic Sea 1 4.5 1 4 0.2× / 5.2 Nav aids · Solomon Sea 1 4.4 1 4 5.0× / 0.2 Nav aids · Bay of Bengal 1 4.1 0 — 5.0× / 0.2 Exercises · Alboran Sea 1 4 0 — new / 0 Quakes · Banda Sea 1 3 0 — 2.5× / 0.4 Quakes · Gulf of California 1 3 0 — new / 0 Quakes · Japan Sea 1 3 0 — 5.0× / 0.2 Quakes · Molukka Sea 1 3 0 — 1.0× / 1 Quakes · Sea of Okhotsk 1 3 0 — 1.0× / 1 Ordnance · Tyrrhenian Sea 1 3 0 — 2.5× / 0.4 Nav aids · Bristol Channel 1 1.8 0 — 1.7× / 0.6 Exercises · Ionian Sea 1 1.8 0 — 5.0× / 0.2 Ordnance · Philippine Sea 1 1.4 0 — new / 0 Wrecks · South Pacific Ocean 1 1.4 1 1 new / 0 Other · Irish Sea and St. George's Channel 1 1.1 0 — new / 0 Nav aids · Arafura Sea 1 1 0 — 5.0× / 0.2 Nav aids · Ionian Sea 1 0.9 0 — 5.0× / 0.2 Cable ops · Bass Strait 1 0.8 0 — new / 0 Towing · North Atlantic Ocean 1 0.3 1 0 new / 0 Incidents · Timor Sea 1 0.2 0 — new / 0 Incidents · Great Australian Bight 1 0.1 0 — 2.5× / 0.4 Incidents · Tasman Sea 1 0.1 0 — 1.3× / 0.8 Incidents · Bismarck Sea 1 0 0 — new / 0 Wrecks · English Channel long running 0 112 4 974 0.0× / 0.2 Nav aids · Mozambique Channel 0 112 4 287 0.0× / 0.2 Cable ops · Caribbean Sea 0 84 3 120 — / 0 Nav aids · Singapore Strait 0 82.6 2 352 — / 0 Wrecks · North Sea long running 0 74.5 2 475 — / 0 Wrecks · Baltic Sea long running 0 56 2 426 — / 0 Wrecks · Coral Sea long running 0 56 2 388 0.0× / 0.6 Nav aids · Persian Gulf 0 56 2 86 0.0× / 0.6 Volcanic · Philippine Sea 0 56 2 160 — / 0 Nav aids · South China Sea 0 56 2 259 0.0× / 0.4 Wrecks · Tyrrhenian Sea long running 0 56 2 385 0.0× / 0.4 Surveys · Indian Ocean 0 51 1 37 0.0× / 0.2 Nav aids · Adriatic Sea 0 48.5 1 272 — / 0 Incidents · Sea of Okhotsk 0 48.5 1 50 — / 0 Other · South China Sea 0 44 1 55 — / 0 Nav aids · Andaman or Burma Sea long running 0 34.6 1 394 0.0× / 0.2 Nav aids · Timor Sea long running 0 29.6 1 765 — / 0 Incidents · Adriatic Sea 0 28 1 41 — / 0 Surveys · Adriatic Sea 0 28 1 172 0.0× / 0.4 Nav aids · Arabian Sea 0 28 1 231 — / 0 Other · Bass Strait 0 28 1 56 0.0× / 0.2 Wrecks · Bay of Biscay long running 0 28 1 467 — / 0 Nav aids · Bering Sea 0 28 1 210 — / 0 Nav aids · Caribbean Sea 0 28 1 273 0.0× / 0.2 Wrecks · Celtic Sea 0 28 1 104 — / 0 Other · Coral Sea 0 28 1 32 — / 0 Nav aids · Eastern China Sea long running 0 28 1 493 — / 0 Other · Greenland Sea long running 0 28 1 554 — / 0 Ordnance · Indian Ocean 0 28 1 28 — / 0 Wrecks · Irish Sea and St. George's Channel long running 0 28 1 605 0.0× / 0.2 Cable ops · Java Sea 0 28 1 123 0.0× / 0.4 Wrecks · Kattegat long running 0 28 1 374 0.0× / 0.4 Nav aids · Laccadive Sea 0 28 1 308 0.0× / 0.2 Wrecks · Malacca Strait 0 28 1 247 — / 0 Nav aids · Mediterranean Sea - Eastern Basin 0 28 1 43 — / 0 Other · Mediterranean Sea - Eastern Basin 0 28 1 71 — / 0 Incidents · Mediterranean Sea - Western Basin 0 28 1 32 — / 0 Ordnance · North Pacific Ocean 0 28 1 140 0.0× / 0.4 Wrecks · North Pacific Ocean 0 28 1 140 — / 0 Other · Persian Gulf 0 28 1 155 0.0× / 0.4 Wrecks · Persian Gulf 0 28 1 252 — / 0 Nav aids · Philippine Sea 0 28 1 259 — / 0 Wrecks · Red Sea 0 28 1 299 — / 0 Other · Rio de La Plata 0 28 1 161 — / 0 Wrecks · Sea of Okhotsk 0 28 1 150 — / 0 Nav aids · Skagerrak 0 28 1 240 — / 0 Wrecks · Skagerrak long running 0 28 1 477 — / 0 Structures · South China Sea 0 28 1 110 — / 0 Nav aids · Sulu Sea long running 0 28 1 412 — / 0 Ordnance · Mediterranean Sea - Eastern Basin 0 20.5 0 — — / 0 Spills · North Atlantic Ocean 0 13 0 — 0.0× / 2.4 Cable ops · Tyrrhenian Sea 0 11 0 — — / 0 Nav aids · Tasman Sea 0 7.5 0 — 0.0× / 0.6 Ordnance · Eastern China Sea 0 7.4 0 — — / 0 Other · Ligurian Sea 0 6 0 — — / 0 Debris · Ligurian Sea 0 5 0 — — / 0 Surveys · Tasman Sea 0 4 0 — — / 0 Containers · Tyrrhenian Sea 0 3 0 — — / 0 Ordnance · Yellow Sea 0 2.5 0 — 0.0× / 0.2 Nav aids · Mediterranean Sea - Western Basin 0 2.3 0 — 0.0× / 0.6 Other · South Pacific Ocean 0 1.6 0 — 0.0× / 0.6 Other · Adriatic Sea 0 1.5 0 — — / 0 Structures · Mediterranean Sea - Eastern Basin 0 1.5 0 — — / 0 Quakes · Gulf of Mexico 0 1.4 0 — — / 0 Cable ops · Gulf of Guinea 0 1 0 — 0.0× / 0.2 Cable ops · Gulf of Mexico 0 1 0 — — / 0 Cable ops · Singapore Strait 0 0 0 — 0.0× / 0.2