The Boy in the Submarine – Season 3, Episode 5: Puffer Fish
Puffer fish are actually a whole family of fish with somewhere between 120 and 200 species. They are famous for their ability to blow themselves up like a balloon to scare off predators, but that’s not their only defence! Puffer fish are very poisonous and anything that eats them is in serious trouble. Many of them have spines on their body as well. They need all the defences they can get, because they are slow and clumsy swimmers.
Puffer fish scrape algae from rocks, or use the “beak” made up of their fused-together front teeth to crack open the shells of snails, crabs, and shellfish. They can be found anywhere the water is warm, and live both in salt and fresh water.
24 Feb 2026
The Boy in the Submarine – Season 3, Episode 4: Bowhead Whales
Bowhead whales are baleen whales who live in the icy Arctic Ocean. Their bow-shaped heads have a hard plate on the top that lets them smash through the ice when they want to come up for air. They are incredibly long lived, with lifespans of around 300-400 years. They are also amazing singers with an incredible range of haunting vocalizations. They are an important filter feed that controls the population of krill and plankton in the Arctic.
10 Feb 2026
The Boy in the Submarine – Season 3, Episode 3: Remoras
The remora is a fish that sticks to the underbelly of bigger creatures. They eat the food that the creature they are riding misses, and helps keep them clean: a perfect picture of symbiosis!
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