Step 7: Safety and accessories
if you DIE, I am not responsible, YOU took this on at your own risk
drowning is very possible in the device, I suggest using it in a pool first, using it with an adult, and doing primary tests unmanned.
SUFFOCATION IS ALSO A HUGE SAFTY RISK, limit dives to no more than five minutes, and be sure to get fresh air into the chamber between dives.
EMBOLISM: the popping of your lungs. always exhale while ascending.
for accessories, I would say: cellphone/ walky-talky in a jar, emergency air supply (compressed air in a bottle), timer fo watching dive times. goggle or mask, knife for cutting ropes and freeing weight if situation becomes dire.