Mr Hammond tries to take a picture of a blue whale, but gets too close - all that can be seen is a patch of blue! Andy heads to the Atlantic Ocean in his safari sub to get a new photo, learning all about the blue whale and its immense size in the process - but will he be able to take his picture and make it back in time?

Mr Hammond is keen to impress his brother, sea-life expert Professor Hammond, with an undersea fact. So Andy helps out by investigating the one fact the Professor doesn't know: where the sea kraits of Niue Island lay their eggs. His journey features an elaborate sea krait dance and takes him deep into the caverns underneath the island.

When Andy inadvertently destroys some special, nutrient-rich mud for Safari World's new mudskippers, he has to find some more to replace it. He heads to the coast of southern Japan, where he encounters jumping mudskippers and a hidden egg burrow.

At the opening of Safari World's new Galapagos dome, Andy finds that he can't answer a question about how sea lions deal with annoying flies. Blasting off in his safari sub, Andy heads to the Galapagos Islands to find out the answer. Along the way, he goes surfing with some sea lions, meets one of their pups and comes across a creature called a lava lizard.

Andy heads to the Pacific coast of California in search of a sarcastic fringehead.