My kids have tried these devices before - they need some patience! And a bit of luck. Ever tried to get that pink pony with the grappling claw in that machine at the entrance to Fred Myers? I never wanted a pink pony anyway. But lassoing a crabs leg and getting it to the surface may be even more difficult! I have found they hold on with their claws until they reach the surface and then let go and laugh at you. Happens all the time. Good luck - let us know if you catch a meal!