Drove down to Target this afternoon and after deftly weaving through the herd of overweight women each leading a small circus troupe of screaming children I managed to escape with a small plastic tub and a drill bit that is exactly the same diameter as aquarium air tubing. Things I did not find were hot glue guns, fishing line (to anchor the bouy) or dignity.
In the course of navigating that glorious monument to capitalistic excess/fatty zoo I noticed they carry water cooler jugs. Huge, cylindrical, made of sturdy transparent plastic and they come with their own watertight caps. "Holy shitballs" I said outloud after waiting for children to wander within earshot, "This would make a perfect enclosure for Hampture Mk.II". Moments later my two brain cells began to rub together and it occurred to me that I wouldn't actually be able to get the necessary equipment *inside* there as the opening was too small (giggity). I'd need something I could fully open up and then, when everything was assembled, seal in a way that water wouldn't get in. It'd need to be rounded, transparent and made of very sturdy plastic as Hampture Mk2 will be a minimum of 8 feet underwater, possibly more depending on what point in my downward spiral into depravity I am at by then. I have no idea what sort of container would meet those specifications (sturdy transparent plastic, large but not too large for one person to move around, rounded shape, can be opened but is also watertight when closed) anything you can suggest would be appreciated.
I searched around to see what other people had done, and found this astonishing nonsense.
Their hamster sub uses two hoses, one to feed air into the sub (via hand pump) and the other to return stagnant air to the surface. I won't be using an exhaust hose for Hampture Mk1, but I'll need to for Mk2 due to the greater pressure making the use of a moon pool problematic. I'll also need an air pump far more powerful to push fresh air down that far. I considered using two car batteries and an inverter to power something like this, but then in an epiphenal realization of my own stupidity I remembered that there exist compact battery powered automotive air compressors. They'll run for hours, are relatively weatherproof, offer pressures around 260psi and it'd save me the trouble of wiring up the batteries with the inverter and waterproofing all of it. Obviously that powerpack would be in it's own waterproof tub, though. We're talking about a support bouy sufficiently large (probably 3 feet by 2 feet by 1 foot) that it's pointless unless the habitat is much, much bigger than Hampture Mk1. and much deeper as well.
I'm getting ahead of myself, though. I can't afford to build any of that unless Hampture Mk.I pans out and I get enough donations for that power pack, as it's the most expensive component of the MkII habitat. With any luck, the MkI prototype will prove the viability of the concept and it'll turn out that you're all fascinated enough by the prospect of a large scale deep water mammal habitat that you'll fund Mk II.