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A lone diver explores an underwater world using torches as he dives into a vast cavern.<br />
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The underwater caves and passages are around 40ft deep and are completely dark with the only light coming from collapsed cave chambers.<br />
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Inside the limestone caves, caverns and passages are stalactites - an icicle-shaped formation created from minerals - which have formed to be more than 2m long.<br />
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Photographer Franco Banfi spent four days exploring the Tucatan Peninsula's Riviera Maya, in Mexico, with each dive into the underwater systems taking around two hours.<br />
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© Franco Banfi/Solent News & Photo Agency<br />
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