A 2,017-ton German submarine surfaced 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 showed how allied forces carry out covert landings from submarines in challenging coastal zones.

The exercise brought together multiple allied nations, combining submarine operations with overland commando movements in a live exercise environment. Scenarios like this are growing in number as NATO focuses on combined arms coastal tactics.

Separately, the Australian Naval Institute raised concerns about fragile supply chains underpinning nuclear submarine programs, a warning that creates new urgency to long-term procurement planning for Australia's future submarine fleet. Analysts say consistent supplier availability will be a deciding factor as Australia works toward standing up its submarine capability.