THE BAY is a modestly effective ecological found-footage horror film, shot in the style of a documentary. It's not terribly scary, it can be clumsy and obvious, and there are some plot holes that would have been much smaller had it not been set in the age of the internet; but I would give it fairly good marks for efficiency, effort, and ingenuity in utilizing its modest budget. If it fails to be very scary by my lights, it is more than occasionally disturbing, which ain't a bad consolation prize.
THE BAY is about an outbreak of parasitism which occurs on a festival weekend on a rather isolated island in Maryland in the Chesapeake Bay. While the townsfolk are gearing up to celebrate, disgusting parasites, blown up to large proportions by all the sewage, chemicals and what-not being pumped into the Bay, begin to manifest in the population. As chaos and panic spread, the government seals off the island and the corrupt local mayor does his best to obfuscate the truth of what is happening. Scientists and doctors do their best to identify and contain the outbreak, but as the bodies pile up and the system breaks down, the main goal of those who remain is simply survival. None of them are extraordinary folk: some acquatic scientists, an ER doctor, a few couples, a baby reporter who is really just an intern, some small-town cops. Thankfully there are no beefcake former SEALS with degrees in epidemiology or "scientists" who look like Playboy models. Just salt of the earth people whose world crashes down in a single day.
As I said above, this movie combines both ecological horror, which can be very preachy and obvious, with the rather tired vehicle of "found footage" or docu-horror...but it does so in a fairly effective way. The idea here is that this town's survival depends on chicken farming, a de-salinization planet, and fishing, all of which combine to create a perfect storm of chemical poisons which threatens, ironically, to annihilate the town via the aquatic super-parasites, which burrow through their hosts, consume their tongues and finally drop out of their mouths in a disgusting, vomitous form of birth. Most of the movie's horror is found in these scenes, but they are more deftly handled and less gratuitous than one might expect, especially one sequence handled entirely via police audio. The characters don't exactly leap off the screen with blistering performances, but the actors do their jobs efficiently, and the editing is not obnoxious. I don't buy the idea of the post-disaster cover-up, and the movie would have been much more effective had it been set in the 70s, but you can't have everything in a low-budget flick like this. To put it another way, for a B-movie, there is considerable craft here, a quality I admire.
All in all I think this is a decent horror movie which kind of takes an environmental riff on the played-out Zombie Apocalypse trope and does it more than reasonably well. As a guy who grew up in Maryland, I can also say that the pollution in the Bay, one of the most beautiful places on earth, continues to be a disgrace despite some earnest efforts to clean it up, and the idea that we will shortly pay a steep price for this sort of stupidity is much less of a movie conceit than any of us want to believe.