World champion freediver Tanya Streeter is in the Galapagos Islands to see how freediving has evolved. She encounters primitive diving lizards and turtles that can hold their breath for hours, before getting exhausted keeping pace with a flightless cormorant. Dive Caribbean - Coral Reef is next Sunday.
Producer James Honeyborne ; Series producer Wendy Darke BBC MAGAZINE: Wildlife, F310 monthly. New issue on sale 24 November