As soon as he was sure that he was at the deepest part, he curled himself into the foetal position, let most of the air out of his lungs, swallowed his tongue, rolled his eyes up, slowed his heart down to almost nothing, and became effectively "dead" save that he was not actually discorporate and could start his engines again at will.  He also elected to stretch his time sense until seconds flowed past like hours, as he had much to contemplate and did not know how quickly Jill would come to get him.