To capture the footage used in the film, Hall and his team logged over 350 hours underwater. The sheer weight of the equipment posed a problem both on land and in sea. A forklift was required to unload the 1,300-pound camera and 1,200 pounds of film from the airplane in New Britain. Underwater, it took four people to complete the actual filming. Two divers to hold the camera steady and two more who stood (or swam) by to help maneuver. In addition, three people on the dive boat were required to oversee the reloading of film. The special IMAX film records only three minutes of footage per roll, forcing the team to do their research beforehand. According to Hall, production began a year before the actual filming, giving divers time to scout the various sites and find the best times for filming.