During a massive 1999 NATO exercise, JTFEX/TMDI99, the Dutch submarine HNLMS Walrus penetrated an entire US Aircraft Carrier Strike Group (CSG) and delivered simulated torpedo strikes against the USS Theodore Roosevelt, a supercarrier, and multiple escort vessels.
The incident wasn’t a fluke either; six years later, the Swedish HSwMS Gotland performed a similar feat, demonstrating that multi-billion dollar carriers are indeed vulnerable to relat…