Operator stated that he was being towed from the Virgin Basin toward Callville because of engine failure.  Upon approach of the eastside of the narrows, noticed that he was standing in water.  The un-identified vessel that was towing him towed him closer to shore.  The two occupants abandoned the vessel before beaching it as it continued to take on water and ultimately sink.  Depth at the location was later found to be 150''.
North Las Vegas               