Over geologic time the central volcano becomes extinct, followed by erosion and subsidence beneath the sea surface, leaving the coral reefs as a ring around (or cap on) the submerged island remnant.
由于侵蚀和海底的下沉，经过地质时代的变迁，中心的火山已经不见踪影，而只留下珊瑚礁环绕或覆盖在沉入海底的火山岛上。
Tireless was taking part in an Anglo-American exercise and was submerged under the ice cap at the time of the accident.
塔尔里斯号当时正在进行英美对抗演练，事发时，该艇突然上浮冲出冰盖。
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