That's true. Though I can't find any instances of the RCN sending a ship to Alert, even in the summer. Our new submarines may visit in the warmer months, but only nuclear-powered subs can safely operate under the ice.
Considering that a modern conventional diesel submarine with AIP (air independent propulsion) like the Korean KSS-III can operate submerged for about 21-days
if speed is limited to 4-6 knots, for a max submerged travel of approx 2,500 nautical miles, the boats simply do not have the range for winter ops. My hope is that the new boats will keep our skills sharp until we can get nuclear submarines in the 2050s. By then Korean will be offering the world nuclear powered versions of their KSS.
South Korea’s ambition for nuclear-powered submarines received a boost when President Donald Trump announced on 29 October 2025 that the US government had given a green light for Seoul to build such boats on American soil.
www.navalnews.com