Renantur,
sadly, we were not able to break open the 2nd vault (positioned at 45degrees) since the owner just ordered us to leave for so many reasons , legal means and/or foul, after seeing the concrete vault. i could say, greed got us booted from the said place.Its alright, those were just first level concrete obstacles...umpisa pa lang sa pahirap nyo yan..hehe
Based on my treas map of GL sites, the vanishing concrete vault is not yet the treasure vault. Its just one of the several 10 feet thick and hard concrete obstacles as you dig in.....sand trap, mud trap, water trap, poison is still what you encounter as you dig in..
In fact, there is a Japs characters in the map which translated to..
" very difficult, isn't it?" as if the Japs is toying with us... "...mukhang nangaasar pa ang Japs sa nakasulat mapa...hehe :-)