I was reading this <a href="https:&#x2F;&#x2F;earth.esa.int&#x2F;documents&#x2F;973910&#x2F;1006684&#x2F;RR3.pdf" rel="nofollow">https:&#x2F;&#x2F;earth.esa.int&#x2F;documents&#x2F;973910&#x2F;1006684&#x2F;RR3.pdf</a> (Satellite Gravimetry) earlier today after seeing this article as I remembered nuclear submarines used gravimeters.<p>Is there any information on them being used to track other subs, as I was wondering if that was possible, I know they&#x27;re apparently used to map the sea floor though.<p>Edit:<p>This is interesting:<p>&quot;He showed a figure of gravity increasing by
about 2 microgal over a 4-h period as men shoveled snow from the roof of the SG station&quot; -<p><a href="http:&#x2F;&#x2F;ethesis.helsinki.fi&#x2F;julkaisut&#x2F;mat&#x2F;fysik&#x2F;vk&#x2F;virtanen&#x2F;studieso.pdf" rel="nofollow">http:&#x2F;&#x2F;ethesis.helsinki.fi&#x2F;julkaisut&#x2F;mat&#x2F;fysik&#x2F;vk&#x2F;virtanen&#x2F;s...</a>