Largest crater caused by a hydrogen bomb

On 1 March 1954, the US government performed its largest ever nuclear weapons test on Bikini Atoll, Marshall Islands. The 13.6 megaton hydrogen bomb explosion, code-named Bravo, vapourised two islands, half of a third one, and millions of tonnes of sand, coral and sea and plant life. This left behind a crater with a diameter of around 1,800 m (6,000 ft) and a depth of around 70m (240 ft).