In many ways, this reminded me of "Aces High" (1976). An example of young, barely pubescent, men sent to a war that would test their mettle to the extreme as they lived each day, perilously, as it came. This time, these young men are encased in a few hundred tons of creaking metal submarine and are tasked with harrying the Allied convoys travelling to and from the UK as World War II continued. The crew are led by an unorthodox captain (Jürgen Prochnow) and with the combination of underwater claustrophobia and paranoia now coupled with far more effective protection tactics from their enemy, the...