A 2,017-ton German submarine appeared off the northern tip of Scotland during a recent military exercise, giving British commandos a staging platform to reach shore by inflatable boat, climb the coastline, and direct the guns of a 401-foot Portuguese frigate at targets inland. The drill demonstrated how allied forces carry out covert landings from submarines in difficult shoreline environments.

The exercise brought together a mix of allied military units, combining submarine operations with direct cliff assaults in a live exercise environment. Scenarios like this are increasingly common as NATO focuses on amphibious and covert capabilities.

Separately, the Australian Naval Institute raised concerns about fragile supply chains underpinning nuclear submarine programs, a warning that adds pressure to long-term procurement planning for Australia's future submarine fleet. Analysts say reliable sourcing will be critical as Australia works toward fielding nuclear-powered submarines.