The BBC has taken a peep inside Britain's biggest cave. It's called Titan and it sits under the Peak District in northern England. It's so huge you could fit St Paul's Cathedral in it!
The entrance was hidden for a long time but Titan was eventually discovered six years ago by a caver using some info he found in a 200-year-old diary
You enter the cave by abseiling down a 50m hole and by walking through muddy water!
The rocks are limestone and the cave was created by rainwater dripping through cracks in the ground over millions of years and wearing away the rock
The explorers who discovered Titan hope to find more caves - they think there might be another in the area!
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