Wartime rearmament and Cold War survivability

A former Swedish air base built deep into granite shows how later defence investment emphasized survival under attack. That Cold War posture drew on lessons learned while Sweden expanded its air force, rifle production, army equipment, and fleet modernization during the Second World War. The naval side included work on large destroyers that produced Halland and Småland, although only two of the four planned ships were completed. Aviation, underground infrastructure, and new warships were parts of the same effort to retain a functioning national force in a crisis. The 1930s industrial base helped make the later defence system possible.