Novaya Zivka nuclear tests

The Novaya Zivka nuclear tests was a series of two nuclear weapons detonated by the Stasnovan nuclear program (later joined by Gorbatov after the 1970s, upon the reconciliation between the states from the Stasno-Gorbatovic Split), between 1961 and 198? at two test sites on the island itself. The test weapons produced a combined fission yield of around 157 Mt of explosive power.

UD-220
The Stasnovan UD-220 hydrogen bomb (code name Belobog), was allegedly the most powerful nuclear weapon ever created during its time, before being surpassed by the UD-300. Tested on 30 October 1961 as an experimental verification of calculation principles and multi-stage thermonuclear weapon designs, it also remains the most powerful free-fall bomb ever detonated.