any idea what's this?

saw couple of those in shallow waters on St. Marten a few days ago.

It's about 18-20 inches long, and moving very slow.

Thanks,

icuda

That's a nice Sea Cucumber

is it the classic donkey dung too .. http://www.saltcorner.com/sections/zoo/inv...s/Hmexicana.htm

Sea cucumber, no doubt!