the first ever hydrogen bomb detonated (Operation Ivy: Shot Mike) completely vaporized the island it was detonated on, leaving a giant undersea crater in its place. there was an island there, and now it's just fucking gone.
The island was Elugelab in the Enewetak Atoll
Before the Ivy Mike test:
After the Ivy Mike test:
the thing about the Ivy Mike test, though, is that the bomb was too big, impractical, and heavy to carry in an airplane, afix to a rocket, or fire from a canon. still, the blast had a yield of 10.4 megatons, rivaled only by the infamous Castle Bravo test (US 15 megatons), the B-41/ Mk-41 Bomb ( US 25 megatons), and the Tsar Bomba test (USSR 50 megatons).
The rest of these bombs can be dropped from airplanes. The Tsar Bomba design was, however, never put into production as a practical weapon and was simply intended to be a one-off exercise with the goal of creating the largest yeild atomic weapon in history. (it succeeded)