Deepest man made hole

 This question was asked on Koun Banega Karodpati program recently.

Question 

Deepest man made hole is in which country ??

1.  Australia 

2.  Russia 

3.  United States of America

4.  China 

Answer 

When this question appeared on TV screen,  I thought may be for some water connection pipe or sewage pipe correction or underground telephone cable, they might have dug the land  !!!!

Why we should bother ????!!!!

But when the options appeared,  I had to take back my words.

People of those contries dig the land wih a reason  !!!!

But I didn't know the answer.

Even the contestant didn't know  !!!!!

He had quit the game.  But correct answer was         RUSSIA.....

Before leaving the stage, contestant asked Amitabh Bachchan,

Why they are digging the ground ???

Amitabh Bachchan :  So that I can ask you this question ..!!!!