A roll film negative. On board the submarine Sealion (1959) towards the end of a long refit at Portsmouth. The photographer is in the control room between 59 and 69 stations on the main flat looking to port and up from 62½ station showing a gauge indicating the keel depth in feet on the left with tank gauges above it. A broadcast and intercom control box is on the right with a sonar type 2004 recorder below it.