SSKs fill a quiet, slow local ambush role, while SSNs provide endurance and speed. A conventional boat can be an excellent mobile minefield near home waters, but it must manage battery charging and becomes noisier when it tries to move quickly. A nuclear boat is limited mainly by crew endurance and food rather than fuel, allowing a much higher sustained speed of advance. The comparison therefore turns on time on station: an SSK may expend most of its endurance reaching the South China Sea or fail to reach the Sea of Japan with useful patrol time, while an SSN can remain forward for months. Long-range missiles also push Australia's desired defensive perimeter farther from the continent. A mixed force would cover local and distant tasks, but the actual choice depends on how much reach Australia is willing to fund.
Notable Point · 1:20:01-1:25:29
SSKs, SSNs, and Australia's defensive reach
Conventional submarines are potent local sea-denial tools, but nuclear boats sustain speed and distant patrols that extend Australia's defensive perimeter.