In their last few weeks on The Galapagos, the Halls family investigate the fate of the shark and also get to know the marine iguana. Monty takes Isla snorkelling with sharks, his favorite animal, and then gives a talk at his daughter's school concerning the ocean's top predator. He joins a research expedition, travelling over a 150 miles from human habitation to tag and photograph whale sharks. The work will produce invaluable data for years to come, and help not only protect Galapagos sharks, but all of our oceans.