While fishing, Gilligan reels in an old WW2 mine.

The mine has a timer attached to the top which gets activated when Gilligan’s fishing rod accidentally falls on it. Gilligan and Mr Howell then get ‘stuck’ to the mine when the rings and chains they are wearing become magnetised.

Ending up the hero, Gilligan tows the mine out into the lagoon on the back of a raft where it safely detonates.