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    A friend and I made one of these when we were 15, back in the late seventies. We used silicon to seam the plexiglass and nuts and bolts to hold it in place. We also went to the local hardware and bought thirty feet of aquarium hose with the proper barb fitting and for a air supply line. We hooked the other end to a normal bicycle pump. We drilled holes around the bottom of the helmet to tie milk jugs full of mud to them. Four gallons of mud seemed to be the proper weight. We had a lot of fun using it in the local lake off the floating dock. We also hooked up a recovery rope to the helmet. We didn't strap it on to ourselves. We used an old garden hose to line the shoulder cutouts. Our helmet was an wet entry type, you had to swim underneath it to get into it. We took it down to about 25 ft.
    Never made it to Phase Two which would have external lights on it.
    Hope these memories give you some good ideas.

    With out weight to off-set the buoyancy of the air in the helmet, you will only be strapped to a bobber. You will either need a huge weight belt (very uncomfortable) or weight strapped to the bottom of helmet. Here is another instructable for reference. https://www.instructables.com/id/Homemade-Diving-Apparatus/

    For helmet material I'd go with transparent aluminum...

    Adding weight to the helmet or my body is something i had already planned on doing. Since im testing it out at my college's swimming pool, they have weight belts already there, so ill be able to weigh myself down to possibly keep me sunk until i can't take anymore time being underwater.

    That's a pretty useful instructable there! ill have to refer to it quite a bit.

    How much is transparent aluminum? and where's the best place to get it?

    I'm just gonna laugh, not at you mind. Okay yeah, at you, but I'm not being mean.

    Transparent aluminum is a material from the rather fictional world of Star Trek. It was a plot device in the 5th movie, wherein Scotty(James Doohan) teaches a materials engineer how to make 'transparent aluminum' that was needed to have the strength of a sheet of glass 6 inches thick, but be only 2 inches thick.

    Me not knowing that off the top of my head is solid proof that im not a trekkie! :D

    You know, the last picture reminds me of those nuclear safe suit helmets.

    I'd put more like 360o on the transparent-stuff, that will collapse a bit too easily I think.


    i think you might be right. but then two things would occur. i would look like my head is in part of a water cooler and there would be a greater chance of the helmet leaking.

    if i made this look like something from bioshock, i would get so many style points.