During World War II, a Dutch naval captain, eager to fight against Nazi oppression, faces a deadly dilemma in his struggle for freedom. After escaping from a prisoner camp with the help of a group of brave compatriots, he joins an underground resistance operating in the waters of the Netherlands. These sea warriors, skilled in navigation and ingenuity, work on the fringes of the law as they attempt to sabotage German operations.
The action intensifies when the captain and his team learn that a new and powerful German submarine is about to be deployed, capable of turning the tide of the war at sea. Determined to thwart their enemies' plans, they embark on a dangerous mission to sink the submarine before its launch. With the help of a group of local fishermen, they pose as civilians while simultaneously staying one step ahead of the German spies who are watching the resistance's every move.
The film is not only a tribute to heroism in dark times but also highlights the importance of teamwork, loyalty, and sacrifice. As time runs out, each crew member is forced to confront their own fears and desires, culminating in an exciting and moving climax that captures the essence of the human spirit amidst adversity.