A free app for Android, by Morozov GameDev.

Bikini Bob is a very detailed map loaded with everything you do and don’t expect to see at the ocean bottom: a pineapple house where a little sponge boy lives; a stone house looking like an Easter Island statue – the residence of a grouchy octopus; a great oak growing under a glass dome – the perfect home for an inventive squirrel; a burger shop selling delicious fast-food; a large sunken vessel serving as a shopping center; a huge amusement park incorporating a host of rides and roller-coasters; a prison, a hospital, a motoring school, and a galore of other objects which make Bikini Bob so interesting to explore! This Minecraft map is vast and colorful – you will never get bored while playing in it.