 On 5 September 1942 , Japanese Field Marshal Prince <unk> ( <unk> ) boarded a plane from <unk> to <unk> to <unk> an airport that bears his name . However , he never arrived . One month later , the plane was found to have crashed off the coast of <unk> <unk> , <unk> . The cause of the plane crash was not known . The Japanese later set up a wooden pole memorial made up of <unk> wood in <unk> . The wooden pole was later taken back to Japan by the family of Prince <unk> . 
