No doubt, someone has told you, "There's always a bigger fish out there" when referring to some life problem.  This spear fisherman found out the hard way, that the bigger fish statement is also true in the literal sense too.

The diver finds and spears his fish in textbook form.  The problem starts when he swims over to collect his prize.  A much bigger fish nearly takes the divers hand off in a quick strike to steal the fish.

It's a crazy turn of events that will pretty much ensure that I never scuba dive . . . ever.

Always A Bigger Fish