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[PSUBS-MAILIST] Hatch design



I have been following the development of the sub by Dale for quite some time.
Could anybody tell me what is the cost of the polycarbonate domes that Dale has bought for his sub ?
 
I have been considering to build a 2 man 1 atm sub using an 8mm steel cylinder 2.4m long, 80cm in diameter, and having two domes. The water around Malta is fairly deep, reaching 80-100m just offshore on one side. What would be the design depth for these domes ?
 
Regards to all
 
Herman Cini