RC Submarine "Open Diving Bell" Design

[Johnny28]

Sorry it is not on the interwebs.... except here.... :-)...

[Johnny28]

The Submarine (Motors, Hull, battery's etc.) weighs approximately 6 kilos. Total air volume is approximately 8 litres; I will have 2 litres of ballast....

[Johnny28]

Has anyone used the open diving bell design rather than WTC for a submarine?.

I am in the process of starting to build one and wondered if...