"Aqua Blu" recently returned to the charter market. Many may remember her as an expedition/explorer ship for the British as HMS "Beagle", she was built in 1968 by Brooke Marine. She was converted in 2002 to a luxury yacht and carried the name "Titan" then had another refit which she recently finished.
Latest refit converted her to being a small cruise ship offering 7 and 12 day island itineraries in Indonesia. 30 passengers in 15 cabins. Company that operates her currently runs river cruises up the Mekong and Amazon.
She is powered by 4 Lister Blackstone diesels @660Hp. The company went through a number of buy outs and name changes before ending up as part of MAN in 2000. MAN continues to supply (some) spares and services the engines but no longer makes anything under the brand.