This movie was supposed to be a big summer blockbuster. This isn't a straight to TV movie like Sharknado. The cast certainly backed up the blockbuster billing, but the screenplay and dialog let them down. The special effects are cinematic quality; better than Sharknado. The setups throughout the movie are cheap and thin. There is nothing truly surprising at any point in the story.
Way more of this movie takes place outside of the underwater observatory than I expected. Almost the entire movie is at the surface level of the water. This was a surprise because the trailer made it seem like Lost in Space, but underwater.
The movie has some cheesy elements, but not enough to make it fun. If you like Jason Statham shirtless, skip ahead 45 minutes.