The Kai Kwai is a marine cryptid reported from Hong Kong.
One night in March 1969, a group of students from the University of Hong Kong were playing on the beach when they heard what sounded like a baby crying. One of the group, Benjamin Chae, noticed this strange sound was coming from the sea. Looking out, he saw something enormous lifting its body out of the water about 20 yards (18 meters) offshore. It did not look like a fish, its eyes glowed green, and its total length appeared to be about 20 to 30 feet (6 to 9 meters). They called it Kai Kwai, meaning Sea Devil.
In Chinese, sea monsters are called hai guai（海怪）, so some people believe the name Kai Kwai is a miswritten version of this.
Source[]
- book: John A. Keel, 南山宏（translation）,（1997） 不思議現象ファイル (ボーダーランド文庫 13) ISBN 978-4894563377
- book: 新博物学研究所（2002）驚異の未知動物コレクション (空想博物誌シリーズ 1) ISBN 978-4766113600
- book: Brad Steiger（2010）Real Monsters, Gruesome Critters, and Beasts from the Darkside (Folklore Myths Legends) ISBN 978-1578592203