Work did not stop with the end of the Siege, but instead of continuing straight towards the 'Notch', a tunnel was driven downwards and a large chamber opened under the 'Notch' called St George's Hall, where a battery of seven guns where installed. The Cornwallis Chamber was also excavated at this time.
http://www.the-rock-of-gibraltar.com/Great-Siege-Tunnels/
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