the island just got submerged and disappeared, what kind of device did ben turn to do that?

THE FROZEN DONKEY WHEEL of course.. how else would one move an island??
silly question..
I'm reserving my opinion though.. because I have to remind me that we have polar bears in the jungle.. so a frozen wheel ... 4 toes.. oy

This pretty much explains how The Black Rock ended up in the middle of the island though...

I'm very surprised they actually had a frozen donkey wheel!! :eek:

As speculated, the answer is that a wormhole was the method of travel. I think the writers aren't even going to mention that so as not to confuse casual viewers, but the scientific clues sprinkled throughout all point to wormholes. This episode nailed it down with the Orchid orientation video.

-steve