The Meg movie explained

Professional diver Jonas Taylor (Jason Statham) attempts to save a group of divers from a submerged submarine in the opening scene. Some of them, including Dr. Heller (Robert Taylor), are successfully brought aboard by Jonas, but something soon begins violently attacking the sub. Due to this, Jonas is forced to decide—against Heller's objections—to abandon the submarine in order to avoid certain death. They manage to flee in time for the unidentified force to sabotage the submarine and vanish. It's been five years. at the Chinese coast's Mana One underwater research facility. It is run by a team of scientists led by Jack Morris (Rainn Wilson) and Dr. Minway Zhang (Winston Chao), as well as Zhang's daughter Suyin (Bingbing Li), remote explorer DJ (Page Kennedy), Jaxx Herd (Ruby Rose), the aforementioned Dr. Haller, Mac (Cliff Curtis), Lori (Jessica McNamee), Toshi (Masi Oka), and "The. A small submarine driven by Lori, Tosh, and "The Wall" is being use...