Frank Reade Jr.'s "Sea Serpent;" or, The Search for Sunken Gold
From Author Wars - https://authorwars.com/books/frank-reade-jrs-sea-serpent-or-the-search-for-sunken-gold-2431290.html
From Author Wars - https://authorwars.com/books/frank-reade-jrs-sea-serpent-or-the-search-for-sunken-gold-2431290.html