Cable ops · South Atlantic Ocean surge 63 298.3 12 186 63× / 1 Surveys · Celtic Sea surge 30 46.7 4 28 91× / 0.33 Cable ops · North Atlantic Ocean surge 28 178.9 6 126 28× / 1 Cable ops · Celtic Sea surge 19 61.7 2 31 28× / 0.67 Quakes · Indian Ocean surge 16 45.5 0 — 24× / 0.67 Quakes · Philippine Sea surge 12 33.6 2 24 6.0× / 2 Exercises · North Pacific Ocean surge 10 64.2 0 — 4.3× / 2.33 Incidents · North Pacific Ocean surge 8 68.1 3 63 8.0× / 1 Missiles · North Pacific Ocean surge 8 67.3 2 36 4.8× / 1.67 Surveys · English Channel surge 8 18.9 1 21 12× / 0.67 Incidents · North Atlantic Ocean surge 7 53.3 3 45 4.2× / 1.67 Cable ops · Tasman Sea new 7 29.4 0 — new / 0 Exercises · Adriatic Sea surge 7 21 0 — 7.0× / 1 Quakes · South Pacific Ocean 7 21 0 — 1.1× / 6.33 Exercises · North Atlantic Ocean surge 7 19.5 1 29 3.0× / 2.33 Quakes · North Pacific Ocean 6 16.7 1 28 1.8× / 3.33 Nav aids · North Sea surge 5 197 7 114 2.5× / 2 Nav aids · Coral Sea surge long running 5 117.2 4 379 3.8× / 1.33 Exercises · Mediterranean Sea - Western Basin surge 5 23.9 2 31 3.8× / 1.33 Cable ops · English Channel surge 5 19.8 0 — 15× / 0.33 Incidents · Indian Ocean new 4 223.9 6 64 new / 0 Nav aids · South Atlantic Ocean 4 184.1 6 182 1.3× / 3 Other · South Pacific Ocean surge 4 163.7 5 135 12× / 0.33 Exercises · Aegean Sea surge 4 111.4 4 180 2.0× / 2 Nav aids · Irish Sea and St. George's Channel surge 4 67.3 3 58 4.0× / 1 Ordnance · North Atlantic Ocean new 4 46.1 1 73 new / 0 Other · North Atlantic Ocean surge 4 34.3 0 — 3.0× / 1.33 Icebergs · South Atlantic Ocean surge 4 23.4 2 24 12× / 0.33 Exercises · Ionian Sea surge 4 13 0 — 6.0× / 0.67 Cable ops · Mediterranean Sea - Eastern Basin new 3 137.2 4 112 new / 0 Surveys · North Sea surge 3 52.1 2 46 4.5× / 0.67 Cable ops · Persian Gulf surge 3 46.5 2 120 4.5× / 0.67 Spills · North Atlantic Ocean 3 39 1 30 1.0× / 3 Surveys · South Atlantic Ocean surge 3 24.8 1 43 9.1× / 0.33 Exercises · Tyrrhenian Sea surge 3 17.3 1 28 4.5× / 0.67 Containers · North Atlantic Ocean surge 3 14.4 1 24 9.1× / 0.33 Exercises · Mediterranean Sea - Eastern Basin new 3 12.5 0 — new / 0 Exercises · Bay of Bengal new 3 10 0 — new / 0 Surveys · Irish Sea and St. George's Channel new 3 9.5 0 — new / 0 Quakes · North Atlantic Ocean surge 3 9 0 — 2.3× / 1.33 Surveys · Bristol Channel new 3 4.4 0 — new / 0 Incidents · Coral Sea new 3 1.8 0 — new / 0 Nav aids · South Pacific Ocean 2 158.1 6 328 6.1× / 0.33 Wrecks · South Pacific Ocean new 2 92.5 4 230 new / 0 Nav aids · North Atlantic Ocean long running 2 85.2 3 431 1.5× / 1.33 Incidents · South Atlantic Ocean 2 55.1 2 69 0.9× / 2.33 Ordnance · Tyrrhenian Sea 2 36.1 1 239 3.0× / 0.67 Cable ops · North Sea 2 27.3 0 — 0.6× / 3.33 Other · Indian Ocean new 2 23.3 2 121 new / 0 Derelicts · South Pacific Ocean new 2 21.7 2 14 new / 0 Incidents · Philippine Sea 2 15.6 0 — 2.0× / 1 Wrecks · Persian Gulf 2 8.5 2 4 6.1× / 0.33 Nav aids · English Channel 2 8.4 0 — 1.0× / 2 Exercises · South Pacific Ocean new 2 6.3 0 — new / 0 Ordnance · Persian Gulf 2 6.2 0 — 2.0× / 1 Quakes · Coral Sea 2 6 0 — 6.1× / 0.33 Quakes · Solomon Sea 2 6 0 — 6.1× / 0.33 Quakes · South China Sea new 2 6 0 — new / 0 Debris · North Atlantic Ocean new 2 5.1 2 4 new / 0 Towing · Gulf of Mexico new 2 4.4 0 — new / 0 Missiles · North Atlantic Ocean 2 2.9 1 3 6.1× / 0.33 Other · English Channel 2 2.6 0 — 3.0× / 0.67 Icebergs · North Atlantic Ocean 2 2 0 — 3.0× / 0.67 Other · Great Australian Bight new 2 1.3 0 — new / 0 Incidents · South Pacific Ocean 1 149.9 1 76 1.5× / 0.67 Surveys · Adriatic Sea long running 1 98.4 3 469 3.0× / 0.33 Nav aids · Gulf of Suez 1 63.6 3 59 3.0× / 0.33 Exercises · Black Sea 1 50 1 66 3.0× / 0.33 Nav aids · Andaman or Burma Sea 1 43.9 1 94 new / 0 Other · Tasman Sea 1 43.3 2 42 new / 0 Ordnance · North Pacific Ocean 1 37.4 2 54 1.5× / 0.67 Cable ops · Norwegian Sea 1 37.1 2 48 new / 0 Other · Arabian Sea 1 36.6 1 39 new / 0 Wrecks · Irish Sea and St. George's Channel 1 33.9 0 — 3.0× / 0.33 Nav aids · Caribbean Sea 1 32 2 56 new / 0 Nav aids · Celtic Sea 1 30.9 0 — 0.5× / 2 Surveys · Persian Gulf 1 26.6 1 26 new / 0 Surveys · South China Sea 1 24.6 1 24 new / 0 Nav aids · Mediterranean Sea - Western Basin 1 24.4 0 — 1.0× / 1 Surveys · Bay of Biscay 1 24.3 1 24 new / 0 Other · Mediterranean Sea - Eastern Basin 1 22.3 1 22 3.0× / 0.33 Derelicts · North Atlantic Ocean 1 21.4 1 31 0.6× / 1.67 Other · Bay of Bengal 1 20.5 1 20 new / 0 Restricted · North Atlantic Ocean 1 19.8 0 — new / 0 Cable ops · Arabian Sea 1 18.6 1 18 new / 0 Spills · North Pacific Ocean 1 18 0 — 1.5× / 0.67 Surveys · Ligurian Sea 1 17.3 1 17 3.0× / 0.33 Wrecks · Gulf of Mexico 1 15.1 1 15 new / 0 Incidents · Mozambique Channel 1 14.3 1 14 new / 0 Other · Singapore Strait 1 14.3 1 14 new / 0 Spills · The Coastal Waters of Southeast Alaska and British Columbia 1 14 0 — 1.5× / 0.67 Incidents · South China Sea 1 12.7 1 12 new / 0 Incidents · Bay of Bengal 1 11 0 — new / 0 Derelicts · South Atlantic Ocean 1 6.8 0 — new / 0 Debris · Aegean Sea 1 6.6 0 — new / 0 Other · Malacca Strait 1 6.6 1 6 3.0× / 0.33 Derelicts · Caribbean Sea 1 6.4 0 — new / 0 Derelicts · Indian Ocean 1 6.3 0 — 3.0× / 0.33 Other · Inner Seas off the West Coast of Scotland 1 6.3 0 — new / 0 Exercises · Ligurian Sea 1 5 0 — 0.8× / 1.33 Structures · Irish Sea and St. George's Channel 1 4.7 1 4 new / 0 Exercises · South Atlantic Ocean 1 4.7 0 — new / 0 Surveys · Ionian Sea 1 4.5 1 4 new / 0 Other · Tyrrhenian Sea 1 3.8 0 — 3.0× / 0.33 Ordnance · Philippine Sea 1 3.6 1 3 1.5× / 0.67 Derelicts · North Pacific Ocean 1 3.2 1 3 new / 0 Quakes · Banda Sea 1 3 0 — 3.0× / 0.33 Quakes · Japan Sea 1 3 0 — 3.0× / 0.33 Quakes · Molukka Sea 1 3 0 — 3.0× / 0.33 Nav aids · Indian Ocean 1 2.8 0 — 3.0× / 0.33 Cable ops · Irish Sea and St. George's Channel 1 2.8 0 — new / 0 Surveys · North Atlantic Ocean 1 1.6 0 — new / 0 Nav aids · Great Australian Bight 1 1.1 0 — new / 0 Exercises · Gulf of Mexico 1 1.1 0 — new / 0 Spills · Gulf of Mexico 1 1 1 1 0.4× / 2.33 Nav aids · Bass Strait 1 0.8 0 — 1.5× / 0.67 Incidents · English Channel 1 0.6 1 0 new / 0 Nav aids · Bristol Channel 1 0 0 — 3.0× / 0.33 Nav aids · Singapore Strait 1 0 0 — 3.0× / 0.33 Ordnance · Adriatic Sea long running 0 210 7 385 0.0× / 6 War risk · Persian Gulf 0 120 4 148 0.0× / 1.33 Wrecks · South China Sea 0 98.5 3 262 — / 0 Cable ops · Eastern China Sea 0 90 3 74 0.0× / 3 Nav aids · Inner Seas off the West Coast of Scotland long running 0 90 3 407 0.0× / 1.33 Wrecks · English Channel long running 0 82.4 2 366 0.0× / 0.67 Nav aids · Tasman Sea 0 82.4 2 318 — / 0 Nav aids · Tyrrhenian Sea 0 82.4 2 118 0.0× / 2.33 Other · Adriatic Sea long running 0 60 2 1,292 0.0× / 0.67 Other · Gulf of Mexico 0 60 2 95 — / 0 Wrecks · Kattegat 0 60 2 93 — / 0 Nav aids · Malacca Strait 0 60 2 259 — / 0 Volcanic · North Pacific Ocean long running 0 60 2 518 — / 0 Mines · North Sea long running 0 60 2 842 — / 0 Other · North Sea long running 0 60 2 428 0.0× / 0.67 Wrecks · North Sea 0 60 2 227 0.0× / 0.33 Wrecks · Tyrrhenian Sea long running 0 60 2 617 — / 0 Wrecks · North Atlantic Ocean long running 0 59.5 1 388 0.0× / 0.33 Other · Persian Gulf 0 55.8 1 146 — / 0 Nav aids · North Pacific Ocean 0 53.8 1 108 — / 0 Surveys · Tyrrhenian Sea 0 45.8 1 49 0.0× / 1.67 Surveys · Mediterranean Sea - Western Basin 0 40 1 36 0.0× / 1 Nav aids · Adriatic Sea long running 0 30 1 465 — / 0 War risk · Adriatic Sea long running 0 30 1 442 — / 0 Wrecks · Adriatic Sea 0 30 1 137 — / 0 Nav aids · Bay of Bengal 0 30 1 269 — / 0 Wrecks · Coral Sea 0 30 1 32 — / 0 Other · Gulf of California 0 30 1 95 — / 0 Nav aids · Gulf of Mexico 0 30 1 37 — / 0 Nav aids · Laccadive Sea 0 30 1 92 — / 0 Surveys · North Pacific Ocean 0 30 1 97 — / 0 Other · Red Sea long running 0 30 1 1,666 — / 0 Wrecks · Red Sea 0 30 1 52 — / 0 Other · South Atlantic Ocean 0 30 1 38 0.0× / 0.33 Nav aids · South China Sea long running 0 30 1 394 0.0× / 0.67 Other · South China Sea 0 30 1 311 — / 0 Structures · South China Sea 0 30 1 352 — / 0 Cable ops · South Pacific Ocean 0 30 1 31 0.0× / 0.67 Structures · South Pacific Ocean 0 30 1 54 — / 0 Nav aids · Timor Sea 0 30 1 157 — / 0 Wrecks · Gulf of Thailand 0 29.5 0 — — / 0 Nav aids · Southern Ocean 0 29.5 0 — — / 0 Nav aids · Black Sea 0 27.4 0 — — / 0 Cable ops · Gulf of Oman 0 25.6 0 — 0.0× / 0.33 Cable ops · Singapore Strait 0 15.2 0 — — / 0 Spills · Bering Sea 0 13 0 — — / 0 Surveys · Philippine Sea 0 8 0 — — / 0 Cable ops · Bass Strait 0 6 0 — — / 0 Nav aids · Persian Gulf 0 5.7 0 — 0.0× / 0.33 Debris · North Pacific Ocean 0 4 0 — — / 0 Cable ops · Gulf of Guinea 0 2.7 0 — — / 0 Incidents · Arabian Sea 0 1.4 0 — — / 0 Quakes · Southern Ocean 0 1.3 0 — 0.0× / 0.33 Cable ops · Indian Ocean 0 0.5 0 — — / 0