The manual loading example concerns the Sea Cat installation on HMS Cavalier at Chatham. Its missiles were lifted into the launcher by hand, although the opening anecdote initially attaches the wrong missile name. Seaslug was a much larger weapon, about 1,200 kg, and the County-class destroyers were built around its system. The later correction distinguishes that installation from the Sea Cat equipment sailors could handle manually.
Notable Point · 4:30:32-4:36:16
Correcting Sea Cat and Seaslug
An in-stream correction distinguishes the manually handled Sea Cat from the roughly 1,200 kg Seaslug and its much larger shipboard system.