Temple of Sree Padmanabhaswamy is one of the greatest and mysterious temples of the world. It is not possible to determine with any exactitude, from any reliable historical documents or other sources as to when and by whom the original idol of Sree Padmanabhaswamy was consecrated. The Temple has references in Epics and Puranas.
The temple contains six vaults built under the sanctum sanctorum. While five of the six vaults have been opened, Vault-B, the secret vault remains unopened, opposed by the royal family on the grounds that opening the vault would invite God’s anger.
Most of the beliefs that surround the Vault-B comes from the engravings on the door of the vault that resembles a large cobra who is said to represent the place of recline of the temple deity Lord Vishnu. Stories hence abound of how the door is protected by the snake-god, and can only be opened by sadhus chanting the ‘Garuda Mantra’, the only hitch being there may be no such sadhu in India. If the vault was opened using man-made techniques, it would lead to catastrophes, Hindu mythology experts had felt.
Few years after Mahabharata, men in Krishna’s empire who were known as Yadavas forgot their religious duties and started fighting. Yadava civil war, where even Balarama took part in the battle caused the destruction of the remainder of the Yadu Vanshia and all of them killed each other. This distraught Balaram and he lost all interest in life. He sat under a tree in meditation and soon reached the state of Yoga Samadhi and a spirit in shape of a snake came out of the body, as, Balaram was an incarnation of Adi Anant Seshnaag and his body fell off like a corpse.
He chooses his incarnation first as he is Adisesha and he had to be there in Vaikuntha before Krishna’s return who is Vishnu. The place where he departed is situated near Somnath Temple in Gujarat. The local people of Veraval believe that in the cave near the temple place, the white snake who came out of Balarama’s mouth got into that cave.
There is a great possibility that the white snake (spirit of Balamram) travelled to Sree Padmanabhaswamy Temple and further moved to Pataal Loka by entering through a secret passage which is now closed and exists behind Vault B. It is believed that this temple was constructed on the 1st day of Kaliyug i.e. about 5000 years ago. Srimad Bhagavatha says that before his Samadhi, Lord Balaram visited this Temple, bathed in Padmatheertham and made several offerings.
Inside the vault B, there is a very high possibility that it has a secret passage directly to the Patal Lok and that Patal lok further connects the wormhole to higher dimensions of the universe. Vault B is closed by Naag Pash / Kawach because it will lead to close encounter with the species of Patal Loka and humans which may lead to complete destruction.
If Vault B would be having Gold, Vimana or any kind of UFO then it would have been opened till now just like other vaults. Only Yogpurush with siddhi of Garud Mantra can open this vault because Garud Mantra not only neutralizes the reptiles preserving the secret passage of Patal Loka but also neutralize the effect of high Gravitation pull existing inside the passage. If you open vault b with machines and explosives, gravitation pull encountered will be so hight leading to large-scale destruction and further, there will be head to head encounter with Patal Lokk species leading to the vanishing of the complete world.
What is actually behind this Vault B can be confirmed only after opening it by Sidhpurush with the siddhi of Gardu Mantra and who can recite Garuda Mantra at the frequency which connects all the parallel universe i.e. at the frequency where the basic subatomic particle of the universe vibrates.