[bstanko6]

I was playing with this last night.

1) selecting salvo keeps them open. Even if you deselect salvo and select individual tubes.

2) opening tubes from weapons officer station(TDC) keeps them open

3) opening tubes from attack periscope(conning tower view 3D) keeps them open.

The best way to think about it is this, any input you give at the periscope, look at it as a verbal order to your crewmen since in real life you would not have a TDC in front of you while looking through the scope. So when you select individual tubes from the scope, you are asking for that tube only at that moment. Going to the weapons station means you are physically opening all tubes you want. So they will not close.