: Most "underwater" action was filmed in a dry studio using wires. Critics from Letterboxd noted that actors' movements often lack physics, and it's visibly evident they are not actually in water.

“I thought I was being patient and biding my time... figuring I was well over halfway through this gauntlet of torture, but when I did I discovered I was only 14 minutes into the movie!” Letterboxd · 3 years ago

: The sharks are entirely computer-generated and described as "comical" and "some of the worst CGI" seen in the genre.

: Beyond the central "smart shark in a lab" premise, specific sequences—like a shark throwing a victim through a glass window to flood a room—are lifted directly from Deep Blue Sea. Community Perspectives

: Stars Alex Fong Lik-Sun, Cica Zhou, Wen Dongjun, and Tara Clance.

: A pharmaceutical company's secret lab experiments on sharks to create anti-cancer drugs, resulting in highly intelligent, blood-red mutant sharks that inevitably break loose. Director : Wang Liang.

: It can be found on streaming platforms such as Amazon Prime Video and is sometimes officially free with subtitles on the YOUKU YouTube channel . Deep Review & Criticism