"At times, in order to maximize diving time, we used a 2,500 foot [762 meter] film magazine," says Al Giddings. "Since the 2,500 foot load is about 15 pounds [6.8 kilograms] heavier than the 1,000-foot [305-meter] magazine load, we needed to fool with weights to create the right balance. I wore about 50 pounds [23 kilograms] of weight and no fins and I shot most everything on the bottom, walking around."

"One night I went to the bottom and since I was really heavy with my own weights, I just pulled the camera to the bottom and put it down," recounts Giddings. "The submersible was already in place to make a shot. But I noticed that one of its lights needed trimming, so I turned to the submersible, I trimmed the light and then turned around. And the camera was gone. I thought one of the guys had moved it until I saw them coming with large HMI lights. I suddenly realized that, whereas the previous week the camera had been 10 pounds [4.5 kilograms] heavier from the larger film magazine, it was now lighter and had actually floated up and over the submersible. I looked up and even though it was nighttime, I could see the reading light on the camera's dials. I went roaring to the surface and jumped in the Zodiac. About 30 yards [27 meters] away that camera was just floating peacefully on the surface. But the story is certainly a clue to how every dive presents a new challenge… with a different weight, angle, setup, balance, load and lens. And then you find and film the animals."