As a pre-production assistant and sound recordist on this film, I remember producer Reuben Trane and Director Ken Wiedernorn returning to the production office after taking co-star John Carradine from Miami's airport to his hotel.
Everyone on the crew was interested in how Carradine, in his late '70's and a movie icon if ever there was one, looked, acted, felt, etc. We were all keen to know if he seemed fit and ready for a role that required quite a bit of physical action, including moving as rapidly as possible from a small dinghy to a larger boat, while both were bobbing at sea.
Reuben and Ken came into the office looking morose as someone asked, "So, how IS he?" I don't remember which of them responded, but one of them said, "Let's put it this way, he has trouble walking on flat land with a cane!"
But, trooper that he was, Carradine did everything asked of him without complaint. He was also often "the life of the set", and in between takes or after a days' shooting, he would regale us all with wild tales of Hollywood and the stars and moguls he had known so well.
It's been about 25 years since I worked on "Shock Waves", but the memory of old man Carradine lives on vividly. He was a helluva guy.
