Snake sea cucumber

A large species of sea cucumber in the world. When it expands by sucking in water, it can reach lengths of up to 3 m, but when disturbed it will expel the water and shrink down to a size of around 30 cm.

Scientific Name
Synapta maculata
Order: Apodida, Family: Synaptidae
South of the Nansei Islands, Indian Ocean, western Pacific Ocean