How long does it REALLY take to reload torpedo tubes?

[Wiz33]

Originally Posted by Shadow

It'd be an interesting twist, but it'd really slow things down.

You'd fire your four tubes and then evade all counterattacks and disappear for 15-30 minutes up to a whole hour to launch another all-out strike.

Out of curiosity, why does it take that long? Aren't there automatic (ish) loading mechanisms to get torpedoes from the magazine and into the tube? I suppose the torps are pretty damn well secured within the former.

It's not that long, close the tube door, pump out water (probably slowly to reduce noise), check and clean the tube for any debris that was trapped, remove the old wire spool and any other electronics connections. load new weapon (which won't be that fast given the 3500lbs weight). re-attached new wire spool/electronics. close torp door and given that any weapon handling is probably double or triple checked. That's totally reason. They may speed it up in an emergency but given that anything that has to do with watertight integrity is of the highest priority on a sub. 15 minutes under combat condition still sound reasonable.