Two sisters are exploring the deep blue sea until something goes wrong. As they submerge 47m they encounter a creature that only wants flesh and blood. As they fight their way back to the top, they shortly run out of oxygen. With only an hour left they're not only racing against time they are racing against life and death.Written by
Outpost handled the CG sharks. Reference was their starting point, but an initial challenge also included inserting the digital assets into water tank footage. See more »
The amount of time a diver can breathe on a tank of compressed air decreases with depth. At 47 meters down, a diver would have limited time as the air they breathe is equalized to the pressure at that depth. Every 10m the volume is divided (10m = 1/2, 20m = 1/3, 30m = 1/4, etc.). So 10m below the surface a diver breathes 2x the volume of air. At 50m each breathe is 6x as dense as the air they breathe at the surface. If the diver's surface air consumption (SAC rate) is 30psi per minute that means they would breathe 150 psi per minute at 50m... which is approximately 20 minutes of air. The most common type/size cylinder in scuba diving is an AL80 / 11L at 3,000PSI / 207 bar). Factors that contribute to gas consumption include physiology, fitness level, and stress/panic (such as that caused by being circled by Great White sharks). Thus one hour is highly exaggerated.
US Navy dive tables establish the no decompression limit ("bottom time") for 47 meters (>150 ft) to 5 minutes (not including descent or ascent time). A diver has 20 minutes of bottom time at 100 feet using air (21% oxygen).
When using an open circuit breathing apparatus, as in the film, a diver breathes compressed air. Air is 21% oxygen and 79% nitrogen. 100% oxygen can potentially result in oxygen toxicity at depths past 19.8ft / 6m depth.
It's also quite possible a diver would experience nitrogen narcosis which is similar to being drunk, and simple tasks can be difficult to achieve. Technical diving generally requires Air / Helium (aka Trimix) when diving below 50 meters / 165 feet in order to reduce nitrogen narcosis. See more »
How often do you watch a film from this genre and are made to watch 90 minutes of bad acting, unrealistic sharks, poor camerawork etc, my expectations weren't too high, and I for one was pleasantly surprised. This film is actually really well made, it's very solid, it's well acted, and it manages to generate both terror and claustrophobia, in a way I wasn't expecting. That ending also, talk about out of the Blue ;-) Beautifully filmed, superb location work, sharks that although maybe a little out of character to say the least certainly looked good, and of course added to the terror.
Pleasantly surprised. 7/10
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