It is considered to be fixed to the secret chamber with the “Nagabandham” or the “Nagapasam”, Mantras by the ‘Siddha Purushas who lived during the reign of King Marthanda Varma of 16th century. Basically on this generation people are still unaware about Nagabandham is it true?  Really does it existed in this world??
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Nagabandham it defines such as ‘Bandham’ in sense tying a knot, ‘Naga’ means snakes, Nagabandham totally means tying a knot with the help of snakes. ‘Naga’ where this word actually comes. Let us discuss about the ancestral dynasty of snakes. Kasyapa Prajapati who was created by Lord Brahma, who created 14 Prajapatis  and are been instructed to construct this whole world. Among them Kashyapa Prajapati is like a key for this world. Kashyapa Prajapati has 13 wives and among them , these 5 wives whom the king liked the most  they are Diti, Aditi, Dhanu, Kadru and Vinata. In these

Diti Devi’s childrens are all the Demons…

Aditi Devi’s childerns are all the Gods….

Vinata Devi’s childrens are all the Birds….

Kadru Devi’s childrens are all the Snakes…..
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Vinata Devi and Kadru Devi is like fellow wives. Vinata Devi’s 1st son was “Anur” who took birth without thighs, who was the charioteer of “The sun god.”2nd son was “Garuda” who was vahan of Lord Vishnu. Kadru Devi’s 1st son was “Sesha” since he is the first being of snake. He also called Adisesha. Adi means 1st. He is one we see with Lord Vishnu. Second one is “Vasuki”, the one we see daily with Lord shiva. Being brothers they don’t like each other(eagles v/s snakes), they always had a fight among themselves. From the Garuda, Kadru devi’s childrens are loosing themselves. Vasuki, Taksaka, Karkotaka, Sankhapala, are near about loosing themselves. 12*10,000*360 no. of species are there in snakes. Near about 43.20 billion species of snakes are in our world. In those key role categories are seshanaga, vasuki and taksaka which are important. These species of snakes are slaves of Kadru Devi.

Once Kadru Devi and Vinata Devi had a small bet, where Vinata devi becomes a slave of Kadru devi. The bet is about when Uchesa ( horse was flying in the sky) and Kadru devi says the horse tail was black in color and Vinata devi defend as white in color. Actually the horse tail is white in color but Kadru devi says black in color and if any of them loses the bet, the loser has to be slave of the other throughout the  entire life. By saying this she commands Taksaka, to wrap and roll Uchesa’s tail and taksaka follows the order. In Physical appearance it looks like a white horse with a black tail. Finally Kadru devi wins the bet. This bet creates disputes between brothers. That long lasting disputes between brothers , made them enemies seeded them in their genes. Neither eagles, nor snakes like each other, this common fact was known to us.
Story of Garud and emergence of snakes | Indian Mythology

At that time Lord Vishnu takes birth in Kurma avatar(Birth as tortoise) allows ksheera sagara madanam, where Madana is mountain rolled out with Vasuki. If Vinata devi had the amrutam in this ksheera sagara madanam then she would be relived from being slave to Kadru devi. Kadru devi asks Kashyapa prajapati why should her son vasuki helps for this if so in return she need a blessing for this. Kashyapa Prajapati blesses from now onwards my son Garuda, won’t disturb any of the snake species except Taksaka. Vasuki snake which undergoes for sagara madanam gets amrutam,(a religious drink which gives a immortal life) and releases Vinata devi from being slave. But again, the fear starts in snake species now what to do, but Rahu Kethu who had that amrutam, which was brought to them by Vasuki. They blesses the snake species that for physical appearances we will have snakes in kaliyuga, where in the whole kaliyuga for all such magics, tricks, maya, japas, mantras, black magics for all these your chidrens will be the occupant. They will be blessed worthy for all such things.
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Ancestors Beliefs:

In all those Naga bandham is the precious and the best bandham. Earlier centuries there were some bandhas like pisacha bandham, preta bandham,  where they keep the precious in one place which are being secured by spirits.
THE MYSTERIOUS LAST DOOR AT PADMANABHASWAMY TEMPLE - YouTube

Lord Vishnu(Krishna) when ruled had met with some nidhulu(valuables like gold, diamond) as in that era they had secret storages, which means leaving their spirits chantinh with some tantras, and capturing other’s bodies where spirits resides and survive with those secret valuables.

Now all these topics comes because our most recent case, yes the recent search Nagabandham in Tiruvantapuram, Sree Padmanabhaswamy temple, people think this is the most huge temple, yes it is, but along with this 108 such vaishya temples are also been build at a time. A story lies behind this;  Balarama(Brother of Lord Krishna),  when ruled had met with 100 tonnes kg gold in his kingdom, who also had the samantaka mani which Lord Krishna wins from Jambhavan. But later nobody knows where actually is the samantaka mani. Samantaka mani which later handled by Akrura,(person who use for welfare).After that they started earning 100 tonnes of gold. People then stopped working as they have  gold now, they started planning on business, rather to work hard. Now Balarama who was aggressive and unsatisfied with his people’s behavior, he took the 100 tonnes of gold and builded 108 vaishnava alayas(temples). In 108 vaishnava alayas(temple) underground these gupta nidhi has been placed out. Not only Tiruvantapuram, today 108 alayas(temples) builded by Balrama whose underground has been secured and covered by 100 tonnes of gold.
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The structure in Sree Padmanabha swamy temple was so beautiful. All doors are opened except the ‘B’ door. This door ‘B’ which was straight under lord Vishnu. That door had a secret way to sea. If people observes keenly we can see the tanks or rivers near the temple is always filled with water. Now if people clearly observes then river water starts being empties partially. In the complete structure of temple where sand is surrounded mid of temple structures. Do we people know…. What was the reason behind this…?

 Rain water of the temple never goes out…then where it goes?
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The foremost thing which people should know that the secrets of the temple….We think as secret, but if people clearly studies the temple scriptures, then its like an open secret to all about the temple. There are no secrets.

After a detail study its been said that Nagabandham which was beautifully presented to Door ‘B’ if being opened then all the snakes will ruin the society which means some typical types of virus spread to this world which affects lakhs of people, e.g., corona, in air some dangerous virus may spread where people suppose to die. Nagabandham  is not only one type of bandham like only snakes, it may be Vayu bandham, may be jalabandham, near about 1lakhs of Nagabandham’s are there if we come to know which bandham is this then we can open the Nagabandham. People use to present in different and terrible ways but actually nobody knows what actually resides inside the doors. Some hidden secrets which should not be disclosed, then let it be. Please don’t spoil the nature. Even supreme court ordered not to go or try to open Door ‘B’. If anyone tries to open and it was opened then the people near to the place may suffer with various types of diseases. Even if people gets any valuable items , that will be of no use if they are going to lose their lives. People if asks remedy for this then we suggest only one thing that please keep yourself beware of door ‘B’. Let the secret be the secret. If people get such viruses, then only such people like aghoras, sadhus who know well Nagatantra can cure people. And these days those type of people are hardly to find.

Scientific Beliefs:

In ancient India, snake charmers are seen regularly. The music makes snakes to dance. Audience use to clap, donate and leave. But no one use to think that snakes don’t have ears. But now all are well educated, they know that snakes don’t have ears, it was hypnotized. Snakes in the frequency of snake charmers motion it dances.
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Snake is represented as symbol for kundalini energy field. Also snake skin is very sensitive. It removes the old skin and get the new one. So it can recognize the sound waves and the skin responds to it. So snake can loose the consciousness in certain energy field.
Marthanda Varma, King of Travancore

So by using this also ancient dispute between eagles and snakes they designed a lock system and it is a Nagabandham. In India we had higly talented priests in kerela only. So then Travancore King Martanda Verma ordered these priests started preparing Room ‘B’. Generally process is priests lock all directions and start chanting. Also in that room they leave some poisonous snakes, when mantras are chanted energy fields are created. So by chanting sufficiently and by using yantras energy fields are created. Cobra snakes are hypnotized and placed as security. For e.g. it won’t do anything outside but once if we put hands inside it burrow then it bites. Scientifically people think the same principle, snakes inside room feels like their homes if anyone opens they will be no more alive. So in this way they locked (Astabandhana) created a negative fields and snakes are kept as a guardian. In Puranas we heard that we had 8 sides where 8 snake gods act as a guardian for each side. People must be aware for which side which god act as a guardian.  So this is Nagabandham. We need a positive field to open the lock. Garuda mantram as opposite to Naga mantra. Garuda means eagle. Since eagle is enemy to snake Garuda mantra is required. Not having but also to be pronounced clearly. Then by sound waves positive field is created oppositely and the lock opens. By using this whole process Martanda Varma locked Room ‘B’. Remaining were locked ordinarily after 150 years that room was tried to open, something got happen those people who tried to open that door. If some valuable item like gold or diamond stuff is existing in Room ‘B’ also be locked normally, but some power which is hidden from mankind means they don’t want to go such power to evil hands. If so then  right time door opens for a right purpose and by right Person.

Location: West Nada, Fort, East Fort, Pazhavangadi, Thiruvanthapuram, Kerala 695023

Scientifically or through ancestral beliefs, people must know every thing in the nature had some purpose, please don’t force to happen, at the right moment things happen.