Countries like Australia, Brazil, China, Iran, Japan, Russia, the UK, and the U.S. are heavily investing in submarines because they understand how important they are to modern world security and defense.
With the biggest submarine fleet in the world, China is increasing its capacity by using diesel-electric and nuclear-powered submarines, therefore allowing it flexibility in its regional operations.
Despite restrictions in recruitment, nations with pacifist pasts-like Japan-are upgrading their submarine units and bolstering their maritime defense capability.
Brazil is transitioning from a soft power to a more conventional power with a security agreement with France to build up their submarine fleet.
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