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Scientists embark on an expedition to film bizarre, deadly and extremely rare sharks of the deep sea; the search reveals a glimpse of the elusive ghost shark; Dr. Craig O'Connoll travels to the Bass Strait for sawsharks.
Luke Tipple returns to Shark Week with his team to unravel the mystery behind one of the strangest creatures, the sawfish. They set out on the most dangerous dive to help bring this rare creature back from the brink of extinction.
A review of the greatest moments from Shark Week 2017, including the close calls, big bites, great gadgets, and viewers' top picks.