Fort Amherst was constructed in 1756 to defend the naval dockyard and the River Medway against the threat of a French invasion.

BBC: Lights switch-on at Chatham's historic fort

He was arrested after UK Border Agency officials found the drugs during a search of the boat at Portsmouth Naval Dockyard, Hampshire, in June 2012.

BBC: Isle of Wight cocaine yacht trial: Man 'unaware of drugs'

Pachnia, of no fixed abode, and Dylik were arrested after UK Border Agency officials found the cocaine during a search of the vessel at Portsmouth Naval Dockyard.

BBC: Yacht Baila