Yellow, that is kind of blaming the C130 crew which is a little unfair.
The failure was systemic and that was clearly spelled out in the report. It is nearly 25 years since I read it and talked to one of the board members about it; I do not recall the details. A Nimrod crew would have had the benefit of IFF on the Searchwater (if the helo was squawking) and ESM information (if either the helo or ship was radiating). Borne of long experience they would also have had a healthy scepticism of surface unit PIMs.
YS