It appears he has been hiding since Gosport in various places on the boat
After rigourous interrogation (the pictures are too graphic to publish!) he admitted his name was Jon Gale. It appears he jumped ship from 'Crews Control' to escape the Solent and seek fame and fortune elsewhere!
He seems happy on board, and is fitting in well, but he doesn't yet realise that being a 'skipper', things will always be his fault! Skippers always get the dirty jobs to do, pity we hadn't found him before we had to unblock the heads pump!