Project Terror Attack of the Giant Leeches

Tonight, on Project Terror, Attack of the Giant Leeches. When I was a kid growing up in San Antonio, TX in the 1970s and 1980s, I loved trying to stay up late on Friday Nights watching the local broadcast of old horror and monster movies. One of my favorites was Attack of the Giant Leeches.
Attack of the Giant Leeches (originally to be called The Giant Leeches) is an independently made, 1959 black-and-white science fiction-horror film, produced by Gene Corman and directed by Bernard L. Kowalski. It stars Ken Clark, Yvette Vickers, Bruno VeSota and Jan Shepard. The screenplay was written by Leo Gordon. The film was released by American International Pictures on a double bill with A Bucket of Blood, and was retitled Demons of the Swamp for its UK release. Later, in some areas in 1960, Leeches played on a double bill with the Roger Corman film House of Usher.

Attack of the Giant Leeches was one of a spate of "creature features" produced during the 1950s in response to Cold War fears; a character in the film speculates that the leeches have been mutated to giant size by atomic radiation from nearby Cape Canaveral.
In the Florida Everglades, a group of gigantic, intelligent leeches live secretly beneath the depths of a deep swamp. Following the violent death of a local fisherman near the swamp, game warden Steve Benton (Clark) sets out to investigate the cause, despite local authorities blaming the incident on an alligator.
Only a few days after, two more locals, Liz Walker (Vickers) and Cal Moulton (Emmet) go missing near the swamp, while having an affair behind the back of her husband (VaSota), who is wrongly blamed for their deaths (eventually committing suicide while in jail). Search parties are formed throughout the surrounding area looking for the bodies but none are found, and two more men go missing.
Steve, with the aid of his girlfriend, Nan Grayson (Sheppard), and her father, Doc Grayson, discover the gruesome truth, the giant leeches are not only the cause of the disappearances, but are also feeding on their victims (who are imprisoned in an underground cave), slowly draining them of blood. Steve and his friend Mike (Kelley), both divers from the war, dive to the bottom of the swamp. They find the cave’s underwater entrance, but are attacked by the leeches. With the use of spearguns and knives, they manage to kill one, but are forced to retreat before they can save a single victim, all of which are found dead.