It’s a confounding mystery of World War II: What happened to the 136 missing sailors from the explosion and sinking of the USS Turner?

After all, the ship did not go down in battle or even in the open sea, but while anchored near New York Harbor in 1944, so close to the city that shockwaves from the onboard munitions blasts shattered windows in some buildings.

Now, newly discovered documents show that the remains of four of the missing sailors were indeed found and buried not long after the disaster in separate graves for unknowns in a Long Island veterans cemetery.

And the researcher who found the documents suspects many more remains could have been found and buried along with them in those same simple gravesites, marked only with the words “Unknown U.S. Sailor” and “January 3, 1944,” the day the destroyer sank.