APPRENTICES spent 24 hours locked on board a Second World War submarine.
The new crew of HMS Alliance was recruited by the Royal Navy Submarine Museum in Gosport to help raise funds to save the submarine from decay.
The apprentices, who all work for EDF Energy, took part in the marathon on Friday.
Working in four-hour shifts like real submariners, they had to keep watch, clean and maintain the submarine around the clock.
EDF Energy project manager Wayne Jackson said: ‘It was a tremendous lesson in life and in history.
‘The submarine museum supports the apprentice programme by allowing the apprentices to take over the museum each year. The students use the site to complete their apprentice programme.
‘This is an opportunity for the students to give something back to the museum for all the superb help they have had.’
The apprentices had to re-enact emergency dives and first aid procedures and were limited to war rations.