Cable ops · South Atlantic Ocean 20 69.6 4 28 0.5× / 38.4 Incidents · North Pacific Ocean 11 245.2 10 73 1.7× / 6.6 Exercises · North Atlantic Ocean 11 75.1 2 34 1.7× / 6.6 Exercises · Arabian Sea surge 11 62.4 0 — 5.5× / 2 Derelicts · North Atlantic Ocean surge 10 81.7 3 148 5.0× / 2 Exercises · Laccadive Sea surge 10 80.1 2 31 8.3× / 1.2 Exercises · Bay of Bengal surge 10 44.3 0 — 10× / 1 Exercises · Black Sea surge 9 42.1 3 25 45× / 0.2 Quakes · South Pacific Ocean 9 27 0 — 1.5× / 6 Cable ops · North Atlantic Ocean 8 51.7 1 160 1.1× / 7 Incidents · North Atlantic Ocean surge 7 52.9 2 41 2.1× / 3.4 Nav aids · North Sea long running 6 119.8 2 584 0.8× / 8 Nav aids · South Atlantic Ocean 6 90.7 3 238 1.1× / 5.2 Spills · North Atlantic Ocean surge 6 75 2 36 2.7× / 2.2 Icebergs · Southern Ocean surge 6 31.1 3 31 7.5× / 0.8 Derelicts · South Atlantic Ocean surge 6 15.6 1 25 4.3× / 1.4 Incidents · Philippine Sea surge 5 219.5 7 56 2.8× / 1.8 Nav aids · Tyrrhenian Sea surge 5 101.6 5 296 4.2× / 1.2 Missiles · North Pacific Ocean 5 56 2 32 1.3× / 4 Nav aids · North Atlantic Ocean surge 5 39.3 2 70 3.1× / 1.6 Exercises · Mediterranean Sea - Eastern Basin surge 5 38.1 2 27 3.6× / 1.4 Other · Mediterranean Sea - Eastern Basin new 5 18.4 2 60 new / 0 Incidents · Indian Ocean surge 5 16.9 0 — 2.8× / 1.8 Incidents · South China Sea 4 145.9 5 74 1.5× / 2.6 Incidents · South Pacific Ocean 4 111.5 3 74 0.9× / 4.4 Nav aids · Indian Ocean surge 4 59.7 1 42 6.7× / 0.6 Cable ops · Gulf of Suez new 4 54 3 44 new / 0 Icebergs · South Atlantic Ocean 4 18.6 2 23 1.8× / 2.2 Incidents · South Atlantic Ocean 3 57 2 62 0.9× / 3.2 Derelicts · Mediterranean Sea - Eastern Basin surge 3 18.2 0 — 5.0× / 0.6 Containers · North Atlantic Ocean surge 3 18.2 0 — 2.5× / 1.2 Nav aids · Inner Seas off the West Coast of Scotland 3 14.6 0 — 0.5× / 5.6 Incidents · Mediterranean Sea - Eastern Basin surge 3 13.5 1 24 5.0× / 0.6 Quakes · North Pacific Ocean 3 9 0 — 0.7× / 4.2 Surveys · Greenland Sea new 3 8.3 3 2 new / 0 Incidents · Coral Sea 3 1.3 0 — 1.5× / 2 Other · Japan Sea 2 58 2 30 2.0× / 1 Spills · Gulf of Mexico 2 30 2 30 0.7× / 3 Surveys · South Atlantic Ocean 2 26.2 1 32 3.3× / 0.6 Cable ops · North Sea 2 25.3 0 — 0.6× / 3.2 Ordnance · Philippine Sea 2 15.5 0 — 10× / 0.2 Incidents · Arabian Sea 2 14.3 1 26 2.5× / 0.8 Nav aids · South China Sea 2 13.3 0 — 5.0× / 0.4 Containers · Mediterranean Sea - Western Basin new 2 13.1 0 — new / 0 Derelicts · Ionian Sea 2 8.7 1 7 10× / 0.2 Derelicts · North Pacific Ocean 2 7.4 0 — 5.0× / 0.4 Cable ops · Celtic Sea 2 7.2 0 — 0.9× / 2.2 Other · North Pacific Ocean 2 7.1 1 11 1.4× / 1.4 Nav aids · Celtic Sea 2 6.4 0 — 0.7× / 2.8 Quakes · Indian Ocean 2 6 0 — 1.0× / 2 Cable ops · Persian Gulf 2 6 0 — 5.0× / 0.4 Quakes · Philippine Sea 2 6 0 — 0.7× / 3 Quakes · Solomon Sea 2 6 0 — 0.6× / 3.2 Ordnance · Greenland Sea new 2 5.1 0 — new / 0 Exercises · Andaman or Burma Sea new 2 5 0 — new / 0 Incidents · Bass Strait new 2 0.3 0 — new / 0 Exercises · Aegean Sea 1 88.6 2 59 0.2× / 4.2 Nav aids · South Pacific Ocean 1 87.6 3 148 0.4× / 2.4 Incidents · Adriatic Sea 1 66.2 2 71 new / 0 Cable ops · Arabian Sea 1 49.1 2 44 0.8× / 1.2 Wrecks · North Atlantic Ocean 1 47.8 2 85 new / 0 Surveys · Mediterranean Sea - Eastern Basin 1 46.4 2 56 1.0× / 1 Nav aids · English Channel 1 35 1 53 0.2× / 4.6 Exercises · Malacca Strait 1 32.1 1 30 2.5× / 0.4 Exercises · Mediterranean Sea - Western Basin 1 31.3 0 — 0.4× / 2.4 Other · Yellow Sea 1 29.9 1 30 1.7× / 0.6 Surveys · North Sea 1 29.8 1 63 0.4× / 2.6 Exercises · Tyrrhenian Sea 1 29.6 0 — 0.5× / 2.2 Nav aids · Alboran Sea 1 28.3 0 — new / 0 Cable ops · Bay of Bengal 1 28 1 119 1.7× / 0.6 Nav aids · Malacca Strait 1 25.3 1 25 new / 0 Other · Persian Gulf 1 24.2 1 24 2.5× / 0.4 Other · Sea of Marmara 1 22.6 1 22 5.0× / 0.2 Containers · Celtic Sea 1 21.2 0 — 1.7× / 0.6 Nav aids · Tasman Sea 1 17.1 0 — 1.7× / 0.6 Incidents · Gulf of Aden 1 17 1 17 new / 0 Nav aids · Great Australian Bight 1 14 1 72 1.0× / 1 Exercises · Japan Sea 1 12.8 0 — new / 0 Surveys · Celtic Sea 1 12.3 0 — 0.2× / 4.2 Incidents · Gulf of Guinea 1 10.1 1 10 new / 0 Cable ops · Red Sea 1 9.7 0 — new / 0 Other · Inner Seas off the West Coast of Scotland 1 9.5 0 — new / 0 Cable ops · Timor Sea 1 8 0 — new / 0 Other · North Sea 1 7.6 1 7 1.7× / 0.6 Surveys · North Atlantic Ocean 1 7.2 1 7 0.6× / 1.8 Cable ops · Ionian Sea 1 6.4 0 — new / 0 Containers · Tyrrhenian Sea 1 6.4 0 — new / 0 Debris · South Pacific Ocean 1 6.1 0 — new / 0 Exercises · Adriatic Sea 1 5.9 0 — 0.2× / 5.4 Incidents · Red Sea 1 5.5 1 5 new / 0 Other · Mediterranean Sea - Western Basin 1 5 0 — new / 0 Debris · North Atlantic Ocean 1 4.9 0 — 1.3× / 0.8 Debris · Mediterranean Sea - Eastern Basin 1 4.6 0 — 5.0× / 0.2 Cable ops · Tasman Sea 1 4.5 0 — 2.5× / 0.4 Containers · Ligurian Sea 1 4 0 — 2.5× / 0.4 Derelicts · Indian Ocean 1 3.7 0 — 1.7× / 0.6 Exercises · South Pacific Ocean 1 3.7 0 — 5.0× / 0.2 Cable ops · Mediterranean Sea - Eastern Basin 1 3.6 0 — 0.5× / 2.2 Exercises · North Pacific Ocean 1 3.6 0 — 0.1× / 7.2 Exercises · Alboran Sea 1 3.4 1 3 5.0× / 0.2 Ordnance · North Sea 1 3.2 1 3 new / 0 Quakes · Arafura Sea 1 3 0 — new / 0 Quakes · Bismarck Sea 1 3 0 — 0.7× / 1.4 Quakes · Japan Sea 1 3 0 — 2.5× / 0.4 Quakes · Molukka Sea 1 3 0 — 0.8× / 1.2 Quakes · North Atlantic Ocean 1 3 0 — 1.0× / 1 Quakes · South Atlantic Ocean 1 3 0 — 1.7× / 0.6 Containers · Southern Ocean 1 2.9 0 — new / 0 Derelicts · Coral Sea 1 2.7 0 — 1.7× / 0.6 Exercises · Philippine Sea 1 2.1 0 — 5.0× / 0.2 Ordnance · Bay of Bengal 1 2 0 — new / 0 Other · English Channel 1 1.9 0 — 5.0× / 0.2 Nav aids · Timor Sea 1 1.3 0 — new / 0 Cable ops · Irish Sea and St. George's Channel 1 0.8 0 — 0.3× / 3.2 Surveys · Philippine Sea 1 0.8 0 — new / 0 Derelicts · Arafura Sea 1 0.7 0 — 5.0× / 0.2 Surveys · Arabian Sea 1 0.6 1 0 new / 0 Derelicts · Great Australian Bight 1 0.6 0 — 5.0× / 0.2 Incidents · Mediterranean Sea - Western Basin 1 0.5 1 0 new / 0 Ordnance · Norwegian Sea 1 0.3 0 — new / 0 Incidents · Eastern China Sea 1 0.1 0 — new / 0 Derelicts · English Channel 1 0 0 — new / 0 Piracy · Indian Ocean 1 0 0 — 5.0× / 0.2 Nav aids · Persian Gulf long running 0 96.4 3 451 0.0× / 0.6 Wrecks · North Sea long running 0 84 3 617 — / 0 Nav aids · Mediterranean Sea - Western Basin 0 73.5 2 127 0.0× / 0.6 Wrecks · Baltic Sea long running 0 56 2 791 — / 0 Nav aids · Bay of Bengal 0 56 2 35 0.0× / 0.4 Nav aids · Coral Sea long running 0 56 2 1,044 0.0× / 3.4 War risk · Persian Gulf long running 0 56 2 392 0.0× / 1.6 Nav aids · Red Sea 0 56 2 80 — / 0 Wrecks · South China Sea long running 0 56 2 519 0.0× / 0.6 Incidents · Ionian Sea 0 53.5 1 48 0.0× / 0.2 Nav aids · Irish Sea and St. George's Channel long running 0 42.6 1 1,031 0.0× / 2.4 Ordnance · Indian Ocean long running 0 33 1 393 — / 0 Nav aids · Arabian Sea 0 28 1 57 — / 0 Wrecks · Arabian Sea 0 28 1 79 — / 0 Other · Bass Strait 0 28 1 329 0.0× / 0.2 Nav aids · Eastern China Sea long running 0 28 1 858 — / 0 Wrecks · English Channel long running 0 28 1 498 0.0× / 0.2 Other · Greenland Sea long running 0 28 1 919 — / 0 Surveys · Gulf of Oman 0 28 1 225 — / 0 Nav aids · Ionian Sea 0 28 1 48 0.0× / 0.4 Wrecks · Japan Sea 0 28 1 30 — / 0 Wrecks · Kattegat long running 0 28 1 739 0.0× / 0.4 Other · Laccadive Sea 0 28 1 95 — / 0 Ordnance · Ligurian Sea long running 0 28 1 376 0.0× / 0.2 Wrecks · Makassar Strait 0 28 1 262 — / 0 Other · Malacca Strait 0 28 1 155 — / 0 Surveys · Mediterranean Sea - Western Basin 0 28 1 311 — / 0 Ordnance · North Pacific Ocean long running 0 28 1 505 0.0× / 0.4 Exercises · Persian Gulf 0 28 1 35 — / 0 Nav aids · Savu Sea 0 28 1 360 — / 0 Other · Sea of Okhotsk 0 28 1 44 — / 0 Wrecks · Skagerrak long running 0 28 1 842 — / 0 Nav aids · Solomon Sea long running 0 28 1 369 0.0× / 0.4 Cable ops · South China Sea 0 28 1 29 0.0× / 1.2 Nav aids · Southern Ocean 0 28 1 41 — / 0 Other · Southern Ocean 0 28 1 39 — / 0 Other · Tyrrhenian Sea 0 28 1 49 0.0× / 1.2 Wrecks · Tyrrhenian Sea long running 0 28 1 478 0.0× / 0.4 Structures · Mediterranean Sea - Eastern Basin 0 26.6 0 — — / 0 Cable ops · Singapore Strait 0 26.6 0 — 0.0× / 0.2 Nav aids · North Pacific Ocean 0 25.5 0 — 0.0× / 0.2 Surveys · Gulf of Mexico 0 24 0 — — / 0 Wrecks · Mediterranean Sea - Eastern Basin 0 23.7 0 — — / 0 Surveys · Sea of Marmara 0 20 0 — — / 0 Cable ops · South Pacific Ocean 0 20 0 — 0.0× / 2 Other · Irish Sea and St. George's Channel 0 13.9 0 — 0.0× / 0.2 Derelicts · Bay of Bengal 0 13.6 0 — — / 0 Other · Adriatic Sea 0 10 0 — — / 0 Other · North Atlantic Ocean 0 6 0 — 0.0× / 0.4 Incidents · Persian Gulf 0 5.4 0 — — / 0 Derelicts · Tasman Sea 0 5 0 — 0.0× / 0.4 Other · Gulf of Guinea 0 3.5 0 — — / 0 Wrecks · South Pacific Ocean 0 3.5 0 — 0.0× / 0.2 Other · Tasman Sea 0 3.5 0 — 0.0× / 0.2 Incidents · Arafura Sea 0 2 0 — 0.0× / 0.4 Mines · Inner Seas off the West Coast of Scotland 0 1.7 0 — — / 0 Ordnance · Arabian Sea 0 1.2 0 — — / 0 Missiles · South Pacific Ocean 0 0.9 0 — — / 0 Debris · Gulf of Mexico 0 0 0 — — / 0 Spills · North Pacific Ocean 0 0 0 — 0.0× / 1 Exercises · Sulu Sea 0 0 0 — — / 0