Spring and summer. (Principal Photography began in May 1974.)
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It was filmed at sea world Orlando
Navarre Florida I am from Ft. Walton Bch. And remember it well I was in high school.
The movie was filmed in several places e.g.Universal Studios HollywoodUnderwater scenes were filmed off the coast of South AustraliaOther ocean scenes were filmed in U.S. waters (locations I don't know)
The Heritage House. It was closed, but may have re-opened under new owners in June, 2012.
Heritage House on the Mendicino coast.