What impact did the submarine have on the soilders in the war?

Submarines significantly altered naval warfare by introducing a new dimension of stealth and surprise, leading to increased psychological stress among soldiers. Their ability to launch surprise attacks on enemy vessels without warning heightened the sense of vulnerability for naval personnel. Additionally, submarines played a crucial role in disrupting supply lines and blockades, which affected troop morale and operational effectiveness on land. Overall, the presence of submarines contributed to a more complex and perilous battlefield for soldiers during the war.