Once the ship comes close enough alongside, Al uses a remote control system similar (in principle) to that of a remote control car to drive Sentry in close beside the ship - at which point Andy, assisted by Justin and Tim, use hooks on poles to latch strong lines on to Sentry so that it can be lifted aboard ship. That bright orange hook on the top of the vehicle is the first place where we need to get Sentry on the end of our line.