The ships embodied different wartime jobs and loss assumptions. Before the Falklands War, Invincible combined anti-submarine work with interception of Soviet maritime-patrol aircraft, while the postwar adaptation placed greater weight on air defense and traded the Sea Dart system for more aviation space. Invincible protected forward anti-submarine barriers and forces reinforcing Norway, so preserving the carrier mattered to the wider campaign. Ocean was expected to rush troops north, unload quickly, and face a high probability of being hit or sunk. Her lighter, partly commercial standard accepted that risk while keeping the more valuable Invincible-class carriers available for fleet air and anti-submarine tasks.
Notable Point · 1:47:22-1:50:17
Cold War amphibious ships were designed around acceptable risk
Invincible protected northern anti-submarine operations, while Ocean was expected to rush troops to Norway under much greater risk.