the show echo bubble sound effect use to put me to sleep . a very soothing show . i think i might have sleep through the part where there be danger or peril . i have also hear that some set up shot for a show on sponge diver be shoot in tarpon spring and florida . i would assume lloyd bridge never dive there . i only remember the show in rerun and although it be never edge of the seat exciting we would make up our own underwater episode in the lake at my grandmother house . imagine the echoed bubble sound and narrate our adventure in our head . i thought flipper have good undersea action . of course and he have the advantage of be in his natural environment .