Chief Minister Devendra Fadnavis is expected to visit the bunker today, a Raj Bhavan official said.
Rao accompanied by his wife Vinodha visited the bunker today, after which the Governor expressed his intention to consult experts from various fields to preserve it.
The Governor had directed to get the bunker opened after he was informed by old-timers three months ago about the presence of a tunnel inside the Raj Bhavan.
Instead of an underground tunnel, an entire barrack with 13 rooms of different sizes was found.
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The bunker opens with a 20-ft tall gate and a ramp on the western side. There are long passages and small to medium rooms on either side, he said.
The bunker spread over an area of over 5,000 square feet has rooms bearing the name Shell Store, Gun Shell, Cartridge Store, Shell Lift, Pump, Workshop etc. There are also scores of Lamp Recesses in the gangway.
Interestingly the entire underground bunker has a drainage system and inlets for fresh air and light, the official said.
According to the history of Raj Bhavans in Maharashtra, Raj Bhavan, formerly known as 'Government House' served as the residence of British Governors since 1885 when Lord Reay turned it into a permanent residence.
Prior to 1885, the Malabar Hill residence served as the Summer Residence of the British Governors. The Government House at Parel served as the Governor's residence before 1885.