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

The exercise brought together multiple allied nations, combining submarine operations with overland commando movements in a live exercise environment. Scenarios like this are becoming more frequent as NATO focuses on amphibious and covert capabilities.

Separately, the Australian Naval Institute raised concerns 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 supply chain resilience will be critical as Australia works toward building out its undersea fleet.