A training video from the Royal Navy at RNAS Culdrose in Cornwall shows that loading weapons with a helicopter is not an easy task.
The accelerated video shows that the task in the relative comfort of an aircraft carrier in Helston is complicated enough, let alone at sea.
A spokesman for RNAS Culdrose said: "Torpedo and depth-loader – shown here accelerates x8.
"Imagine, you do this at night, in a storm, on a rolling flight deck, and the helicopter engines and rotor blades roar above you.
"Pay attention to the leading sailor's hand signals – speaking is not possible on a busy flight deck, so everything has to be done on a signal basis – the entire sequence will take about 10 minutes.
"These budding air technicians are supervised by their instructor and undergo the procedure time and again in the safety of the Merlin Training Facility here in Culdrose.
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"They use full size and weight weapons in a slimmed down Merlin airframe – these helicopters are primarily submarine killers.