But President Donald Trump ’s back-to-back announcements about nuclear testing and nuclear submarines on Oct. 29 during his trip to South Korea could turn the nuclear weapons world upside down.

There has been renewed focus on nuclear arsenals after Russia’s invasion of Ukraine, James C Reynolds and Maryam Zakir-Hussain report

China's been steadily upgrading its submarine fleet and weapons to detect those of the US should the two nations go to war.

Converted bombers would roar a few hundred feet above the sea dropping depth charges and firing rockets; with over 120 Allied aircraft shot down while attacking submarines this was in no way a one-sided affair.