The team faces its greatest challenge yet - exploring the 90-metre-deep trench of the legendary Rio Negro.
Using an underwater robot to examine the depths proves trickier than anticipated when a storm brews, and as the machine struggles, Mike deGruy heads for the jungle in search of the three-toed sloth.
He eventually ventures into the water - only to come face to face with a predatory fish determined to make him its next meal.
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