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The team must transform a Volkswagen Minibus into a fish tank for a local car dealer. Engineering a tank that will weigh 4,000 pounds when filled with saltwater and fish is the hardest task they have attempted so far. Meanwhile, fish geek Francis is looking for an assistant. Soon, he puts potential candidate Heather to the test by giving her a quiz on fish species, having her go on a deep-sea dive and having her perform a risky surgical procedure on a venomous fish. Will she make it?

The team has been commissioned to revive a showcase aquarium. They must create a seascape that mirrors a sea turtle's natural habitat. However, the tank's marine life, including sharks and stingrays cannot be removed from the premises, so someone will have to swim with the carnivores. Then one tough client wants three tanks in one, completed in a fraction of the time the crew allots for such complex projects. When Heather takes over, the team fears they may lose the job. Will she succeed?