This document provides information about various sea creatures that can be encountered during a swim through the sea, including whale sharks, octopuses, seahorses, dolphins, jellyfish, eels, sea turtles, sea stars, swordfish, great white sharks, clownfish, hermit crabs, squid, manta rays, sea otters, killer whales, manatees, and blue whales. For each creature, interesting facts are shared about their physical characteristics, behaviors, habitats, and in some cases conservation status. The passage encourages learning about sea life and protecting endangered species like blue whales.