Beer or Sake bottles in the cargo hold of the Heian Maru. Almost all the wrecks in Truk Lagoon had plenty of booze. It seems that alcohol was just as important as guns and ammo for the Japanese war effort.
Someone has probably cleaned it from time to time, but that is the original bulb that went down with the Heian Maru over 70 years ago.
This case is in remarkably good condition. It is sitting somewhere relatively deep in the Heian Maru.