I assumed that it was going to be publicly cremated, but I'm not going to complain about a burial at sea.
The important thing is that it doesn't become a rallying symbol, or an object of international controversy. Having it rest at the bottom of the sea is one of the best ways to accomplish those goals.
This was probably the best thing they could have done short of taking him alive.
Who cares what internet "truther" types have to say about it?