ghost ship; phantom ship
Refers to a legendary or fictional ship crewed by ghosts, or a mysterious ship that appears and disappears.
その海域では、夜になると幽霊船が現れるという伝説がある。
There is a legend that a ghost ship appears in those waters at night.
Compound of 幽霊 (yūrei, 'ghost') and 船 (sen, 'ship').