A roll film negative. On board the submarine Sealion (1959) towards the end of a long refit at Portsmouth. The photographer is in the auxiliary machinery space between 62 and 68 stations below the main flat looking to port, slightly forward and up showing the port side between 63 and 65 stations. On the right is a panel marked 'Telemotor pump starter No. 2'. A large air bottle is on the left.