A 2,017-ton German submarine emerged off the northern tip of Scotland during a recent military exercise, giving British commandos a departure point to reach shore by inflatable boat, ascend rocky cliff faces, and direct the guns of a 401-foot Portuguese frigate at targets inland. The drill illustrated how allied forces coordinate covert landings from submarines in contested coastal terrain.

The exercise brought together a mix of allied military units, combining submarine operations with overland commando movements in a high-pressure drill setting. Scenarios like this are becoming more frequent as NATO focuses on amphibious and covert capabilities.

Separately, the Australian Naval Institute flagged risks about unstable logistics pipelines underpinning nuclear submarine programs, a warning that brings added scrutiny to long-term procurement planning for Australia's future submarine fleet. Analysts say consistent supplier availability will be critical as Australia works toward building out its undersea fleet.