Forget The Sharks: How 4. Meters Down Fails Dive Science. This is a guest post by Jake Buehler, who just so happens to be an AAUS certified scientific diver as well as a science writer based in the Seattle area.

He blogs over at Sh*t You Didn’t Know About Biology, which is full of his “unrepentantly celebratory insights into life on Earth’s under- appreciated, under- acknowledged, and utterly amazing stories.”Summer is finally here in the Northern Hemisphere. The days are long, the weather is warm, and the water is inviting. It’s also time for our annual lesson from popular culture that this refreshing invitation is a lie, and that the only thing the sea offers us is electric, blinding terror. Yes, summer inevitably means the advent of a new crop of shark- based survival horror flicks.

This summer, much like the last with “The Shallows”, movie- going audiences will be treated to another shark- centric screamfest: “4. Meters Down.” The British- American film—starring Mandy Moore and Claire Holt—opened in U. S. Recent, somewhat ubiquitous trailers for the film outline its terrifying premise: while vacationing in Mexico, a pair of sisters goes cage- diving with great white sharks, only to have the winch suspending their protective cage fail, sending them plummeting 4. It is no doubt that just like with “The Shallows”, we will again be reminded that the persistent blood lust of horror film sharks is altogether different from what science tells us about the behavior of their real- life animal counterparts. But the film and overall premise of “4.

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Meters Down” commit a litany of science inaccuracy sins completely unrelated to sharks. Frankly, the movie fails spectacularly when it comes to portraying the biology and physics at play during SCUBA diving (which is kind of amazing, actually, considering how much of the film’s plot is directly rooted in the consequences of being underwater). Hi-Def Penguin Counters (2017) Movie.

Being a trained AAUS scientific diver, dive science is an area I know a little about, so I made the commitment to sit through “4. Meters Down” so you wouldn’t have to, all to separate the reality of how diving works from. Lisa reveals that the idea for the trip was largely spurred by her recent breakup with her boyfriend, who left her because he got “bored” with her and their relationship. What better than a spontaneous trip down to Mexico to prove him wrong? Kate attempts to brighten her sister’s spirits by taking her out drinking and dancing until the wee hours of the morning.

In doing so, the sisters meet some local men who tell them about cage- diving with sharks, convincing them to join in the next day. Lisa is terrified of the idea—both beforehand and the next day when they actually make it out to the boat—but Kate reminds her that posting cage- diving photos on social media is a surefire way to cultivate jealousy in her ex.

The cage- diving operation is beyond sketchy (something explained away by one of the local men as “it’s Mexico *shrug*”). The captain of the boat and this whole cage- diving outfit is Taylor, portrayed by a curt, sun- withered Matthew Modine—a man heading an alarmingly rusted and worn down vessel, and wholly unconcerned with whether or not the sisters actually know how to dive in the first place (Kate has some dive experience, but Lisa has absolutely zero, despite telling him otherwise). As the sisters gear up and prepare to descend in the cage, great white sharks start to circle the boat, exciting basically everyone other than super- skeptical Lisa, burdened with the heavy hand of foreshadowing. Some of them are huge, as much as 2. Captain Taylor (which is waaaaay bigger than any recorded great white shark in real life).

Eventually, after a very short safety briefing from Captain Taylor, Lisa and Kate sink just below the surface in the cage, marveling at the shimmering schools of scombrid fishes, and the giant, toothy stars of the event. The two sisters converse with each other (and Taylor up top) using a comm system embedded in what appear to be the most incredible, top of the line full- face masks ever (more on that later), sharing in the excitement. Soon, Lisa decides that she’s had enough shark- induced adrenaline for one day, and that they need to be pulled back up.

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Of course, the Murphy’s Law of horror flicks like these kicks in immediately, and the winch suspending the cage busts, sending them rocketing down to the ocean bottom. It is at this moment that the movie starts sharing “alternative facts” about what happens at depth, which I have broken up below. Under Pressure. Once the cage begins to plummet to the seafloor, Lisa and Kate begin to experience increasing pressure. As more and more seawater stacks up above them as they sink, the pressure exerted on their bodies by all this water goes up. Every 1. 0 meters or so of seawater produces the same amount of pressure as the entirety of the Earth’s atmosphere at sea level. So, at 1. 0 meters down, a person experiences 2 atmospheres of pressure. All that squeezing doesn’t do a whole lot to your solid, fleshy parts—but it does a lot to air spaces.

Gas is compressible, and as the pressure mounts, the air- filled sinus cavities, interior parts of the ears, inside of the mask, and lungs are all impacted. In SCUBA diving, one of the first things you learn is how to combat this pressure upon descent using equalization techniques. This is particularly important for the ears, because if you reach a mere several meters down and fail to equalize any of that pressure pushing in, you can be dealing with a serious amount of pain, ruptured eardrums, and even irreversible hearing loss.

The only real way to avoid discomfort is to descend slowly and equalize as you go, and by slowly, I mean half a meter at a time. Lisa and Kate do not descend slowly.

The cage they are trapped inside of hurtles towards the bottom at a rate that made me wince in sympathy for their poor, doomed air spaces. Once on the bottom, Lisa is shown to have a minor bloody nose, which is the extent to which either of them have any adverse effects from the pressure (also known as “barotrauma”). Increased pressure in the sinuses can definitely cause blood vessels to pop, and this can even happen under normal descent conditions. But because the two sisters are using full face masks and not “conventional” half masks, barotrauma in the sinuses and within the air space of the mask is essentially impossible (the constant flow of air into the full face mask keeps the interior pressure regulated with every breath).

Had Lisa and Kate been wearing conventional masks, it’s likely their free fall to the bottom would have resulted in a catastrophic, excruciating degree of “mask squeeze”, where the outside pressure of the water crams your mask into your face, causing nasty, extensive bruising and your eyes to turn the color of merlot, making you look like Qyburn just brought you back to life. Rather than mask- associated barotrauma, it is far more likely that Lisa and Kate would have blasted out their ear drums after rocketing down to more than five atmospheres of pressure, flooding their ear canals, hitting them with a bout of vertigo and persistent deafness. But, all they have to show for their extremely fast descent is a single barotrauma- induced leaky blood vessel in precisely the wrong location. As they fall to the bottom, there’s a dramatic shot of the display face of a wrist- mounted dive computer cracking, illustrating the extreme depths and pressure Lisa and Kate are plunging towards. Wrist- mounted dive computers are basically high- tech watches designed to relay information to the diver about the environment (current depth, temperature), how long they’ve been below the surface, and other important info.

These devices are flat- out rugged, often outfitted with tough displays made out of scratch- rebuffing mineral or sapphire glass, and rated to accurately register depths of 1. Geo 2. 0 computer put out by Oceanic). These depth ratings?

Meters Down Starring Mandy Moore: Watch the Trailer. Shark week came early for Mandy Moore. The This Is Us star accidentally serves herself up as bait in the exclusive first trailer for this summer’s scariest open- water adventure, 4.

Meters Down. In the thriller, Moore’s character Lisa decides to recuperate from a bad breakup with a trip to Mexico, joined by her sister Kate (Claire Holt). There, the two decide to inject some adventure into their vacation — shark- cage diving. Though reluctant, Lisa and Kate hit the open sea with locals to get up close and personal with great white sharks after being assured it’s “totally safe.”Courtesy Entertainment Studios Motion Pictures. Once suited up and dropped off the side of the boat, however, the unthinkable happens: The rope breaks, leading the cage — and the women — to plummet 4. As their oxygen supply dwindles, Kate and Lisa find themselves surrounded by the deadly sharks — and forced to leave the safety of the cage. RELATED VIDEO: Mandy Moore Reminisces About Her Days on A Walk to Remember.

Screams Lisa as the clip ends, “There’s sharks everywhere!”4. Meters Down is directed by Johannes Roberts, and is set to hit theaters on June 1.