We had to use special effects, but unlike special effects today, they were real. The jet pack we used in "Thunderball" was real - it was invented for the United States Army. Bloody dangerous, and it only lasted a couple of minutes. The ejector seat in the Aston Martin was real and Emilio Largo's boat, the "Disco Volante", was real. You had power boats at that time, but there were no good-sized yachts that were able to travel at 40 to 50 knots, so it was quite a problem. But by combining a hydrofoil, which we bought in Puerto Rico for $10,000, and a catamaran, it at least looked like a big yacht. We combined the two hulls with a one-inch slip bolt and when they split it worked like a dream. We used lots of sharks for this movie. I'd rented a villa in the Bahamas with a saltwater pool which we filled with sharks and used for underwater filming. The smell was horrendous. This was where Sean Connery came close to being bitten. We had a plexiglass corridor to protect him, but I didn't have quite enough plexiglass and one of the sharks got through. He never got out of a pool faster in his life - he was walking on water.