The Ghost Galleon

The Ghost Galleon (1974) is a horror directed by Amando de Ossorio rated 4.9/10.

After a pair of models go missing from a boat, a rescue party discover an empty galleon carrying the coffins of the long dead Knights Templar. The rescue party board the galleon and then discover their own boat has vanished. The survivors struggle to fight off the spectral knights with what little knowledge they have of them.