A 2,017-ton German submarine surfaced 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 showed how allied forces plan and execute covert landings from submarines in difficult shoreline environments.

The exercise brought together multiple allied nations, combining submarine operations with direct cliff assaults in a high-pressure drill setting. Scenarios like this are growing in number as NATO focuses on combined arms coastal tactics.

Separately, the Australian Naval Institute flagged risks about vulnerable procurement networks underpinning nuclear submarine programs, a warning that adds pressure to long-term procurement planning for Australia's future submarine fleet. Analysts say consistent supplier availability will be essential as Australia works toward standing up its submarine capability.