Underwater Sequences
Above or below the surface water is an uncooperative medium. Boats float off-station, lines and gear become entangled and props need to be heavily weighted. Nothing is easy to manoeuvre under water. Allow days, not hours, when estimating schedules.
Contamination
As many coastal seas in the Western hemisphere are too murky to permit underwater filming, sub-aqua sequences are invariably recorded in studio tanks or swimming pools. In studio tanks the water must be treated with chemicals to prevent the formation of green algae which grows rapidly in warm water under artificial lighting.
Foreshortening
Water has different optical properties from air, and the pool or tank which would seem adequately proportioned on the surface ...
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