Why is Vault B at Kerala's Sree Padmanabhaswamy Temple unopened?

Vault B is one of the vaults at Kerala's Sree Padmanabhaswamy Temple. While other vaults have been opened and their contents recorded, Vault B wasn't opened. Travancore royal family, which used to manage the temple, claimed it has a curse over it. Their objection was based on astrological ritual Ashtamangala Devaprasnam. In 2020, Supreme Court refused permission to open it.