Basic Submarine Snorkel Technology ID
The research ID for Basic Submarine Snorkel in Hearts of Iron IV is basic_submarine_snorkel.
Basic Submarine Snorkel
About this technology
A simple airtube running from the engine room to the control tower. Extended, it allows the submarine to run its engines and charge its batteries while still submerged. Mounting this module on Submarines reduces their Visibility, making them harder to detect.