The Galleon's Gold; or, Frank Reade, Jr.'s Deep Sea Search.

"The Galleon's Gold; or, Frank Reade, Jr.'s Deep Sea Search" by Luis Senarens, is a thrilling adventure where young inventor Frank Reade, Jr. dives into the ocean's depths seeking the lost treasure of the Donna Veneta. With his advanced submarine, Reade and his companions brave the unknown of the underwater world, battling monstrous sea creatures and the schemes of the villainous Gilbert Parker, who also seeks the treasure for himself. The quest begins when an antiquarian, turned down by the miserly Parker, convinces Reade to join the hunt for the sunken galleon, leading to clashes between Reade's ingenuity and Parker's treachery, all unfolding beneath the waves.