Watching some mariners on youtube [1] and they take a pretty dim view on the idea of ghost ships, except in certain short haul scenarios. They cite that almost all of the maintenance takes place continuously while the ship is underway. While automation may reduce the bridge crew, until there are cheap robots that can perform all maintenance tasks - from overhauling engines, maintaining equipment, painting everything to protect from marine air, troubleshooting reefer units, to inspecting internal voids, not to mention routine tasks (docking, cargo operations), and emergency tasks (firefighting, damage control) - there's always going to be a decent number on board.<p>[1] <a href="https://www.youtube.com/@JeffHK">https://www.youtube.com/@JeffHK</a>