 Initially "Swain" is there only to steer the boat away from shore, but when the engine fails he makes the decision to remain on board and help Jim cut the wires which will disconnect the detonator from the caesium.With seconds to spare they throw the cases of caesium overboard, but there is no time to get clear of the blast and the boat explodes.Sea Patrol ends with a heartfelt farewell by CO Mike Flynn to his friend and shipmate, Petty Officer Chris Blake, and we see for the first and only time, the young Chloe sitting with her mum, Sally.