Zobex:
Valuables in a tank? I must defer to your personal experience, but... the Japanese tanks that I've seen in pictures look small. What could be hidden in them besides gems or some specie? I suppose you could fit a significant amount of valuable material in them, but if they buried trucks too
Just curious here.
Also, a thought or two: if the tank was buried simply for defensive purposes, wouldn't there be a defensive line discernable? In other words, unless a tank was plugging up a very narrow line that required little depth/bredth, one would think there'd be more (or some other evidence) of a line strung along a ridgeline or other defensible position(s). This may be a tip off to the purpose of the vehicle.
The other thing: it would require more than one tank crew to bury a tank in a timely manner (unless they leveraged some sort of a terrain feature). I mean, unless it was officially sanctioned, wouldn't it be difficult for a small crew of guys to swipe a treasure and not be noticed? When I was in the Army they tended to keep tabs on you. If you were missing, your squad leader, SGT, or LT would know.
So, baring the above, unless you had some soldiers who got lost during a retreat and buried the tank at their own initiative (I don't know if the Jap. soldier were permitted a sense of initiative), it seems to me to be an aberation worthy of investigation.
This is interesting. Good luck and be careful.
Starsplitter