In The Grayson Submarine - Pt 01, the story unfolds deep beneath the ocean's surface, where a state-of-the-art submarine, designed by Charles Grayson, is undergoing a critical test dive. Captain Denning, cautious yet determined, grapples with the decision to push the submarine to its limits at a depth of 350 feet. Despite his fears for the crew's safety, Grayson insists on proving the vessel's strength against the immense underwater pressure. As they descend, the crew's confidence is palpable, but soon, an ominous scraping sound disrupts their progress, hinting at an unseen danger lurking in the depths.