A forgotten 150-metre long, underground British-era bunker has been unearthed inside the sprawling Raj Bhavan complex at Malabar Hill in south Mumbai, an official said on Tuesday. Governor C.V. Rao and his wife Vinodha and senior officials went around the bunker on Tuesday. Around three months ago, some old-timers informed the Governor of the existence of a tunnel inside the Raj Bhavan on the shores of the Arabian Sea. He asked to get it opened. Accordingly, on August 12, the PWD staff broke open a temporary wall that had been erected at the tunnel's entrance on the eastern side. The revelation was suprising. Instead of what was believed to be an underground tunnel, it turned out to be a huge barack with 13 rooms of varying sizes spread over an area of more than 5,000 square feet.