 During the filming of Plenty OTooles fall in the swimming pool,  Lana Wood (I) (qv) actually had her feet tied (albeit loosely) to  a cement block on the bottom. Film crew members held a rope across  the pool for her, with which she could lift her face out of the  water to breathe between takes. Unfortunately, like most pools, this  one had a sloping bottom, and the block was slipping into deeper  water with each take. Eventually it reached a depth from which she  could no longer get her face out of the water. Alert film crew  members noticed this, and quickly jumped into the water to untie her  feet, thus saving her from drowning for real. Wood, being a  certified diver, remained calm during the ordeal, although she later  admitted to a few "very uncomfortable moments" while she was unable  to breathe.