What could be inside Vault B and why haven't they opened it yet?

Vault B is a temple chamber located underneath the sanctum sanctorum of the Main temple deity of the Anantha Padmnabhaswamy temple in Kerala, India. Other vaults were opened and vast riches were found but this vault is religiously sensitive and filled with stories about curses and aliens that deny entry and permission to open it. It's now guarded with paramilitary troops. What is inside this vault and why won't they open it. According to Forbes, they believe that after assessment of the other vaults qualities and modern day inflation, they value the riches in total to be 1 billion dollars USD. but that can't be confirmed unless they open it. Note , pic 7 is not the actual door, but an artists recreation of it, the door does indeed have cobra sculptures guarding it. Why is the government hiding this?