Ah I should probably have added something to the original post. In the UK we have a volunteer organisation of lifeboats that do rescues at sea. The RNLI https://rnli.org/, but there are a handful of totally independent boats that while they work with the RNLi they’re totally self funded and staffed (again all by volunteers this one is from Sidmouth https://www.sidmouthlifeboat.org.uk and earlier this l year I happened to be there on vacation when they had l a training session - this is them returning in the dark 

 Thanks for the update.