Torpedo-tube Mine Deployment Technology ID
The research ID for Torpedo-tube Mine Deployment in Hearts of Iron IV is improved_submarine_mine_laying.
Torpedo-tube Mine Deployment
Naval support1940
Unlock this technology with the research command and the tech ID improved_submarine_mine_laying.
About this technology
Redesigning mines to fit into torpedo tubes allows any submarine to become a minelayer, albeit at the expense of torpedoes carried.