Ghost,
It was in Luna, La Union....that was more than 10 years ago.
We from Manila based TH team was invited to demolished the concrete vault. That was my first japs concrete vault, 4 ft x 3 ft x 12 ft. The composition looks like the road concrete or bridge concrete (parang pundasyon ng tulay kasi solid concrete talaga). Just imagine it was found in the middle of the maybe 100 hectares rice field. According to the rice field owner a Japs came and wanted to buy that concrete vault, thats why they became suspicious. The land owner tried to demolished the vault but he failed only a small portion of the corner was destroyed. During that time, it was newly planted rice and the concrete vault is the only visible object in the middle of the rice field. Thats why if you try to demolish it in the morning by burning it...the whole barrio folks will notice your TH activities.
So we attempted a "commando style of operation"...first we detect it with pulse detector...it went crazy, confirming presence of metal inside. We started to gather some fire woods bcoz we plan to burn it. Suddenly town mayor arrives with his armed goons and ask lots of questions. I suspect the town mayor is a treasure hunter also bcoz he seems interested also with the concrete vault. We immediately leaves the area for fear being killed, bcoz once it will be opened...there could be bloodbath on the spot.
After a week, we heard from our TH asset that it was demolished and recovered more or less 20 pcs, 75 kilos gold bars. tsk,tsk,tsk...Anyways what we have is just a souviner picture of confirmed.... JAPS TREASURE CONCRETE VAULT....