Under Pressure: Making 'the Abyss' -

: The water was heavily over-chlorinated to prevent algae growth, causing the crew’s hair to turn white or green and leading to chronic skin and ear infections. Near-Death Incidents and Actor Trauma

To achieve realistic underwater shots without relying on CGI, Cameron converted an in Gaffney, South Carolina, into the world's largest underwater film set. Under Pressure: Making 'The Abyss'

: To mimic the deep-sea abyss, the production floated 20 tons of black plastic beads on the surface and covered the tanks with a massive tarp to block all sunlight. : The water was heavily over-chlorinated to prevent

: Two giant tanks were filled with over 10 million gallons of water to simulate the lightless ocean depths. Cameron converted an in Gaffney