I wish that I hadn't read this sub now! It's good, really good, but I just want to grab a couple of the ideas and work them into the 30 Starships sub that's been in my to-do folder the last 3 months. Guess I'll come back to that one once this has left my grey cells.
The Lost March is a large collection of elephant rafts. The lost march never reached its destination and instead was pulled out to sea. The elephants on the raft eventually starved to death, littering the large wooden carpet with their bones and bird picked hides. While sailors with an eye for gold can salvage the tusks of the bull elephant for a hefty price, the raft is haunted by the spectral ghosts of the pod of elephants and they appear after nightfall and attack and kill anyone trespassing on their raft