[مستر طارق فؤاد]

Dear Wael:

About the 1st q (the spiders)>>(Although the robbers used technology, they couldn't rob the treasures)
The answer is:
The robbers used high technology like Computer and GPR which enabled them to see what was behind the wall but because of the spiders which bit them all and caused their death, they couldn't get away with the treasures.