Thread:KGBSpetsnaz/@comment-8910099-20181213200925/@comment-1200923-20181214011908

Bikini bottom is located on planet Earth in the Pacific Ocean on the ocean floor below Bikini Atoll hence the name Bikini Bottom. My theory is that radiation from the nuclear testing that took place at bikini Atoll during the 1940s and 1950s is what turned the sea creatures their into how they are today. the radiation could have also given Mermaid Man and Barnacle boy their powers.

Source: Encyclopedia Spongbobia Bikini Atoll page