Question: In the movie All Is Lost, how long did filming in the water tank require?
About the article "All Is Lost", section "Filming".

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Principal photography began in mid-2012 at Baja Studios in Rosarito Beach in Mexico.
Baja Studios was originally built for the 1997 film "Titanic".
Filming took place for two months in the location's water tank.
At a press conference after the film's screening at Cannes 2013, Redford revealed that his ear was damaged during the production.
Being filmed on the water and largely within the confines of a sailboat and liferaft, the film was technically difficult.
It joined ranks with other water-plagued films: Alfred Hitchcock's "Lifeboat"; Roman Polanski's "Knife in the Water"; Kevin Costner's "Waterworld"; James Cameron's "Titanic"; Robert Zemeckis's "Cast Away" and Stephen Spielberg's "Jaws".
She is currently filming the movie "Coffee Shop" in Helena Alabama.  
The Kusannanakere water tank is located in Byse. 
CP Tank or Cowasjee Patel Tank is a former water tank for supplying drinking water in Girgaon, South Mumbai.
Although long vanished, the city of Bombay once had many water tanks within its city limits.
The tanks were once the only source of water to the city.
The tanks were named after philanthropic citizens who donated money to fund the building of these tanks so that the citizens of the city would get a fresh source of drinking water.
The CP Tank was built by Cowasji Rustamjee Patel in 1775.
The Framji Cowasji Tank bordered Esplanade was built by Framji Cowasji in 1831.
All that remains of the tank is a plaque on a wall opposite Metro Cinema in Girgaon. 
The main tank was not ready in time for the first day of principal photography.
Cameron delayed filming for a week and pushed the smaller tank's schedule forward, demanding that it be ready weeks ahead of schedule.
Filming eventually began on August 15, 1988, but there were still problems.
On the first day of shooting in the main water tank, it sprang a leak and of water a minute rushed out.
The studio brought in dam-repair experts to seal it.
In addition, enormous pipes with elbow fittings had been improperly installed.
There was so much water pressure in them that the elbows blew off.
Cameron's choice of cinematographer on the movie was Mikael Salomon - a US-based Danish national who would go on to work on other blockbusters such as "Backdraft" and "Arachnophobia" before moving into the director's slot on a myriad of films and TV shows including two editions of the acclaimed HBO WW2 series "Band of Brothers".
Salomon used three cameras in watertight housings that were specially designed.
Another special housing was designed for scenes that went from above-water dialogue to below-water dialogue.
The filmmakers had to figure out how to keep the water clear enough to shoot and dark enough to look realistic at 2,000 feet (700 m), which was achieved by floating a thick layer of plastic beads in the water and covering the top of the tank with an enormous tarpaulin.
Cameron wanted to see the actors' faces and hear their dialogue, and thus hired Western Space and Marine to engineer helmets which would remain optically clear underwater and installed state-of-the-art aircraft quality microphones into each helmet.
Safety conditions were also a major factor with the installation of a decompression chamber on site, along with a diving bell and a safety diver for each actor.
The breathing fluid used in the film actually exists but has only been thoroughly investigated in animals.
Over the previous 20 years it had been tested on several animals, who survived.
The rat shown in the film was actually breathing fluid and survived unharmed, although the scene was censored in Britain for perceived cruelty to animals.
Ed Harris did not breathe the fluid.
He held his breath inside a helmet full of liquid while being towed 30 feet (10 m) below the surface of the large tank.
He recalled that the worst moments were being towed with fluid rushing up his nose and his eyes swelling up.
Actors played their scenes at 33 feet (11 m), too shallow a depth for them to need decompression, and rarely stayed down for more than an hour at a time.
Cameron and the 26-person underwater diving crew sank to 50 feet (17 m) and stayed down for five hours at a time.
To avoid decompression sickness, they would have to hang from hoses halfway up the tank for as long as two hours, breathing pure oxygen.
The cast and crew endured over six months of grueling six-day, 70-hour weeks on an isolated set.
At one point, Mary Elizabeth Mastrantonio had a physical and emotional breakdown on the set and on another occasion, Ed Harris burst into spontaneous sobbing while driving home.
Cameron himself admitted, "I knew this was going to be a hard shoot, but even I had no idea just how hard.
I don't "ever" want to go through this again".
For example, for the scene where portions of the rig are flooded with water, he realized that he initially did not know how to minimize the sequence's inherent danger.
It took him more than four hours to set up the shot safely.
Actor Leo Burmester said, "Shooting "The Abyss" has been the hardest thing I've ever done.
Jim Cameron is the type of director who pushes you to the edge, but he doesn't make you do anything he wouldn't do himself."
A lightning storm caused a 200-foot (65 m) tear in the black tarpaulin covering the main tank.
Repairing it would have taken too much time, so the production began shooting at night.
In addition, blooming algae often reduced visibility to 20 feet (6 m) within hours.
Over-chlorination led to divers' skin burning and exposed hair being stripped off.
Some of the actors did not like the slow pace of filming.
Mary Elizabeth Mastrantonio remembered, "We never started and finished any one scene in any one day".
At one point, Cameron told the actors to relieve themselves in their wetsuits to save time between takes.
On another occasion, while filming one of many takes of Mastrantonio's character's death scene, the camera ran out of film, prompting Mastrantonio to storm off the set yelling, "We are not animals!"
Michael Biehn also grew frustrated by the waiting.
He claimed that he was in South Carolina for five months and only acted for three to four weeks.
He remembered one day being ten meters underwater and "suddenly the lights went out.
It was so black I couldn't see my hand.
I couldn't surface.
I realized I might not get out of there."
Harris said that the daily mental and physical strain was very intense and remembered, "One day we were all in our dressing rooms and people began throwing couches out the windows and smashing the walls.
We just had to get our frustrations out."
Cameron responded to these complaints, saying, "For every hour they spent trying to figure out what magazine to read, we spent an hour at the bottom of the tank breathing compressed air."
After 140 days and $4 million over budget, filming finally wrapped on December 8, 1988.
Before the film's release, there were reports from South Carolina that Ed Harris was so upset by the physical demands of the film and Cameron's dictatorial directing style that he said he would refuse to help promote the motion picture.
Harris later denied this rumor and helped promote the film.
However, after its release and initial promotion, Harris publicly refused to ever again discuss the film, saying "I'm never talking about it and never will."
Mary Elizabeth Mastrantonio has also since brushed off the film, commenting, ""The Abyss" was a lot of things.
Fun to make was not one of them."