at level 3 to 25, first level giveaways. level 25 to 35 second level giveaways twice the size of the first level. level 35 to 50, last level giveaways bigger than the second level. multiply the depth of all of these in two is a big volume lying beneath. in some places there is a cute small vault near the position of the big volume...
so at level 30 and at level 60....you missed a lot! sorry for that and try and study everything down there. seeing a vault is the same as a true success even if you can't open it.
fom1113