There's a Demon Shark in the Foggy Dark

The Demon Shark creeps around Aqualand
When an amazingly human like 'demon shark' is found frozen in ice, it is sent to the airport to be taken to Aqualand. However, at the airport, the maharaj's jewels are stolen, and the only other thing in the room was the demon shark. Could he really be alive? Days later, when the fog is thicker than pea soup, the gang run into trouble on their boating trip. After climbing ashore, they find themselves at Aqualand,and confronted by the demon shark. After talking to the manager, the keeper, and the professor, they see that the demon shark is still frozen. However, minutes later, he is at large in the fog. Who is the demon shark, and what is his game?
7/10