From: "Phil Payne" 

> So consider were this to work.....the effect upon submarine freedom of
> action etc.
>
> "He said that his program, Merlindown, could peer 75m into the earth and
> 16,000 metres beneath the seas."

Around twenty years ago Paul Martindale of Teradata expounded at some
length in the Old Swan in Tames Ditton about tracking stealth aircraft by
using a parallel processor to work out which stars you couldn't see at any
given time and tracking the resulting hole in the sky.

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