Here is an snapshot of the depth contours for from 0 to 1500 m by 100 meter intervals for the whole of the North Atlantic. Original data is from General Bathymetric Chart of the Oceans. All that was needed was some lines of code in R to convert point values to contour and then generate the kml-file. And adding on top of that the ICES statistical rectangles as a layer, coloured in red.
Zooming in or out in Google Earth environment is a breeze. An example on the macroscale, showing the Porupine bank is shown below.