This depends what vessel you are on. Whether you're onboard a submarine or a ship, your days will be split into shifts known as 'watches'. 'On watch' is when you carry out your duties and 'off watch' is when you can relax, socialise, watch a movie, play video games or use the exercise facilities onboard.

On a submarine the watches are 6 hours on, 6 hours off for most of the crew. Cooks and Marine Logistics Support Operations submariners work an alternate 2-watch routine approved by the Executive Officer. When in harbour, it's a normal 8-hour working day and, depending on your role, you'll stay overnight aboard every 4th or 5th day.

Ships run different watches at sea. Some roles require you to hold watches, others work regular day work hours. When in harbour, it's a normal 8-hour working day and, depending on your role, you'll stay overnight aboard every 4th or 5th day.