I loved the link by @Binbag_the_Saylore about the port that sells liquid hydrogen. It reminded me of a paragraph in a biography that I read about JP Morgan. (Who didn’t sound like that bad of a guy btw?) When on his superyacht at the time, an acquaintance asked Morgan how much it cost to fuel such a vessel and his reply was something like, “If you need to ask, there’s no reason owning such a ship.” Until a few minutes ago I had no idea how much marine grade liquid hydrogen costs. Of course liquid hydrogen isn’t widely available but I’m sure the uber few who can buy such a yacht can just charter a tanker to follow them around?