I had a similar experience off Dairen in China un 1971. The Captain thought it was time for a lifeboat drill, and as we were anchored off waiting for a berth we launched two rowed lifeboats and the motor one. I was engineer on the motor one. We really were minding our own business when thus chinese navy gunboat pulls along side of us abd lots of guns are pointed at hs with instructions to return to the ship. Seems Dairen was akso a naval base and they got a bit hot under the collar.
We did have twin Volvo straight 6's (200hp each)
A "pussy" to handle, catches the wind but had a V hull, draws around 1 metre, so no problem steering into, across, or down wind
Has the power to get out of trouble, go against any flow or tide.
Can run on one engine at tickover - 3mph
If it wasn't for frightening SWMBO crossing the Irish Sea (waves over the fly-bridge) we would still have it.
We now have adjusted to 'muddy ditches' and 'sewer tubes' and enjoy them but there is no comparison to Tupperware doing 25 knts down Gare Lock (Faslane) and being chased by Commados in rubber boats pointing sub-machine guns at you, when they think you are terrorists going to attack the submarines.
We also had lifeboat races in King Gearge 5th Docks jn London (now London City Airport iirc) That was more fun