There’s a surprise visit from the Princess of Wales, concern for a recent arrival, and a pregnancy test for Florence the shark.

There’s a surprise visit from the Princess of Wales, concern for a recent arrival, and a pregnancy test for Florence the shark.

Marcus installs a shark cage to allow visitors a close encounter, and a new octopus arrives from Portugal. Amelia has problems that threaten an ambitious project to replant the seagrass meadows.

Marcus installs a shark cage to allow visitors a close encounter, and a new octopus arrives from Portugal. Amelia has problems that threaten an ambitious project to replant the seagrass meadows.

Ian has to carry out repairs ten metres underwater in the deepest tank in Britain, and there’s a surprise for volunteer Jill, the aquarium's 86-year-old 'ray whisperer'.

Ian has to carry out repairs ten metres underwater in the deepest tank in Britain, and there’s a surprise for volunteer Jill, the aquarium's 86-year-old 'ray whisperer'.

Marcus and Emma head to the Maldives on a rescue mission for an injured turtle. Back in Plymouth, Ian trains Zeus the zebra shark using a toy boat, and Andrew collects fresh seaweed for Larry the lobster.

Marcus and Emma head to the Maldives on a rescue mission for an injured turtle. Back in Plymouth, Ian trains Zeus the zebra shark using a toy boat, and Andrew collects fresh seaweed for Larry the lobster.

Catching rays is a challenge with a sting in the tail. Xav has to find a way to keep Friday the Turtle out of trouble. Freyja gives some care home residents a moving close encounter with sharks.

Catching rays is a challenge with a sting in the tail. Xav has to find a way to keep Friday the Turtle out of trouble. Freyja gives some care home residents a moving close encounter with sharks.

Marcus, the new curator, attempts a high-risk move for a problem shark to the top of the aquarium. Andrew builds a cave for a reclusive lobster, and star attraction Friday the turtle suffers a nasty bite from a mystery tankmate.

Marcus, the new curator, attempts a high-risk move for a problem shark to the top of the aquarium. Andrew builds a cave for a reclusive lobster, and star attraction Friday the turtle suffers a nasty bite from a mystery tankmate.