Sharing the Garvel Drydock with CALEDONIAN ISLES was Serco Denholm's submarine personnel carrier ADAMANT. After being hauled down the drydock, the tug IMPULSE made fast alongside her and towed her round to the neighbouring Great Harbour. ADAMANT, which as can be seen clearly in this view is a catamaran, was built by FBM at Cowes, and is based on a commercial ferry design. She is driven by two water jets at speeds of up to 22 knots. Her principle role at the moment is to ferry personnel to Royal Navy submarines changing crews on the Clyde.