In an ancient planet, stuck in the very corners of the galaxy, lay the Waterfront 1.7-3 planet. It has no ground, but just pure water covers the surface. Only things that can stay and live there: sea monsters, and immense metal ships that hold the human population of that world. The sea monsters have become very smart, knowing how to crack the ship, and get the goodies (humans) inside. The harpoon guns could no longer penetrate the crystal hard scales of the beasts. These immense were getting took down, many a year, until the world's government could not take it. They needed someone or something to kill the beasts the only way it could be killed; blowing up the heart from the inside. No human could withstand the inhospitable fluids in the giant monsters, but the world was galaxy known for the strongest substance known to anything. It took a decade or two, many metal ships down, and a very smart scientist to come up with the perfect soldier, who was a robot that was made with that certain metal. It was not even tested, but a monster attacked and it was activated there. It went inside the monster and blew up the heart with a grenade that the scientist had given it only minutes earlier. It was such a success, the government supported completely, and before Waterfront 1.7-3 knew it, each metal ship had the robot, nicknamed the Waterfront Sentry. From that point on, metal ships were no longer attacked by the sea monsters, but the Waterfront Sentry stands vigilant at all times.