In this episode of The Deep Dive, we explore one of the most consequential military decisions Canada has made in decades: the full modernization and renewal of its submarine fleet. In July 2026, Ottawa selected Thyssenkrupp Marine Systems as the preferred builder for up to twelve next‑generation conventional submarines — a scale of ambition unmatched in Canadian naval history. These boats will be equipped with Air Independent Propulsion and lithium‑ion batteries, technologies that allow them to stay submerged for weeks, operating silently beneath the Atlantic, Pacific, and increasingly contested Arctic waters. We break down why stealthy, long‑endurance submarines have become essential for Canada’s sovereignty, intelligence gathering, and deterrence posture in a world def ...