Chemical warfare!

A nerve gas kills Jackie Hamilton and puts the rest of the crew in danger...

- SEAN MARLAND, CAREN CLARK, NICK CANNON

The crew of HMS Vigil face a desperate fight for survival when a nerve agent sweeps through the nuclear submarine with deadly consequences.

The leak occurred in the vessel’s galley when, at the end of last week’s episode, Jackie Hamilton opened a tin of food contaminated with the lethal substance.

Despite the area being sealed off, Commander Newsome is horrified to discover the toxic matter has leaked into the missile compartment, leaving the submarine unable to defend Britain from attack!