Australia will join a new security alliance with the United Kingdom and the United States to share their top-secret technology, which means we can build our own nuclear-powered subs. And France isn't too happy about it... So in this Squiz Shortcut, we take you through why submarines are such a big deal in defense, the contention around nuclear, what's happening with the French, and our chequered history with getting subs built.Squiz recommends:ABC Radio National: Submarines: 'The history and future underwater warfare'Vigil - available on Foxtel or BingeGreyhound - available on Apple TV See /privacy for privacy and opt-out information.