Off the coast of ireland on the ocean floor a giant grid larger than ireland. Just a google maps thing or what?
http://maps.google.com/maps?f=q&source=s_q&hl=en&geocode=&ie=UTF8&ll=53.994854,-16.391602&spn=7.082407,14.128418&t=h&z=6
looks like washboarding. maybe the way the current runs through there?
Looks like a corn field in the winter to me. Maybe it is Charlie the Tuna's garden.
Looks like the overlap on the sonar passes.
It's squared off, on the lower left. Fascinating.
If you use the google zoom bar - you can drill in for a closer look. The ridges appear to be about 8 to 10 miles apart. (A bit more than a corn field.)