It's called The Legacy. (1978)
couple of links here
http://www.imdb.com/title/tt0079450/
http://www.amazon.com/exec/obidos/tg...glance&s=video
A quote from someone on a message board about The Legacy:-
Quote:
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'This movie made me afraid to swim under water for years, i was only 8 at the time, but now 32 i still think about the water turning to glass when im under it, scarred me for life i guess.'
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:)