Questions:What's the cables for on a sub, and any point in the Radio?

[fastfed]

I was always curious as to what the cables on WW2 subs were for, I assume they're for the either the crew to hold on to while the walk the deck or to give more support for the conning tower..

Also every day or so I send a report, I click both report buttons but the more I think about it, is there really any point???GWX game BTW