Free diving is a very difficult and dangerous sport. Sometimes people can die trying to set this record.
When you go that deep under water without an oxygen tank, all sorts of things happen to your body.
Your lungs are shrunk by the water pressure
Your heart-rate drops to as low as 60 beats per minute
Tanya, 30, comes from West Sussex but was born in the Cayman Islands.
She beat both the men's and women's record for free diving.