The existence of the cave at the former Italian prime minister's Villa¹ Certosa estate had been rumoured² for years but the first photographs of it emerged on Friday.

 

They were obtained by Antonello Zappadu, an Italian photographer who made his name in 2009 by taking long-lens pictures of scantily-clad showgirls at Mr Berlusconi's residence.

 

The cave, which could have come straight out of a James Bond film, features a swimming pool, its floor decorated with a mosaic³（马赛克） of Poseidon, the god of the sea, holding a trident.

 

It is connected to a short tunnel and a gate which reportedly leads straight to the sea.

 

The cave is connected to the rest of the villa by stairs and a passageway, which are illuminated⁴ by discreetly⁵ placed lights set into the floor.

 

The underground complex is believed to have been built in 2004 but has never been seen publicly.

 

"It was the secret services who asked me to carry out the work, after I had received 38 death threats," Mr Berlusconi explained at the time.

 

He said he had sought advice on the design and construction from Pietro Lunardi, a cabinet colleague who was then the minister for infrastructure⁶ and insisted that no planning regulations had been broken.

 

Mr Zappadu, who now lives in Colombia, said on his blog that he had obtained the images from an anonymous⁷ source.

 

The semi-submerged cave is not the only flamboyant⁸（艳丽的） feature at Villa Certosa, a 150-acre estate where Mr Berlusconi has hosted the likes of Tony Blair and Vladimir Putin.

 

He once built an artificial volcano in the grounds of the villa to entertain guests at one of his parties.

 

Mr Berlusconi, who turns 76 this month, stepped down in November when Italy became immersed in the eurozone crisis and after his reputation was damaged by a series of sex scandals, most notably⁹ involving allegations that he paid for sex with an under age prostitute at "bunga bunga" parties at his mansion¹⁰ in Milan.

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