Knowledge of the Ancients

The Padmanabhaswamy temple is the largest treasure hoard on earth - and it is reserved for the god to which it belongs.

From Wikipedia
"With an estimated $22 billion worth of gold and jewels stored in an underground vault. At the time of writing, only 5 of the 8 underground vaults had been opened and explored."

The artefact value puts it in excess of $200 bn.
The indigenous peoples refuse to open the other vault for fear of angering the snake God.