Well we don't know where they took Desmond's boat. They have an own boat as well and I think it is well hidden or/and guarded. I wonder the other's didn't know about Desmond's boat in the first place. They must have known about Desmond being there and pushing that damn button, because I think Ben can switch to the cameras on the losties island as well.
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"Oh yeah you got to talk to the island, yeah right!" - Charlie to Locke
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