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 demonstrated how allied forces plan and execute covert landings from submarines in challenging coastal zones.

The exercise brought together several NATO partners, combining submarine operations with direct cliff assaults in a live exercise environment. Scenarios like this are becoming more frequent as NATO focuses on submarine-launched landing operations.

Separately, the Australian Naval Institute raised concerns about fragile supply chains 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 standing up its submarine capability.