Devaswom Minister Kadakkampally Surendran held talks with the members of the erstwhile Travancore royal family here to hear their views on the matter.
He later told reporters that the royal family was against the opening of the vault as according to them, there were "ritualistic restrictions" on the opening of the "sacred" vault, which had never been opened before.
However, the government has made it clear that whatever decision the apex court takes on the matter, it would be implemented.
Meanwhile, Aditya Varma, a member of the royal family, said the discussion they had with the minister was "private" in nature.
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"If the apex orders to open the vault B, we will obey it," he told PTI.
Varma added that in 2002, when an attempt was made to open the vault, the thantri (the traditional chief priest) of the temple had conducted a 'deva prashnam' (astrological examination of the temple affairs) and held that it should not be opened, he said.
Even after the country achieved independence, the temple continued to be governed by a trust controlled by the erstwhile royal family, for whom Lord Padmanabha (Vishnu) is the family deity.