Giant fleets the oceans trawl,

Gasping fish they skywards haul.

Not just critters do they move,

But sediments they push and groove ...

Ten times greater their extent

Than the land that farmers dent!

What will come of shelf slopes now,

Underneath the deep-sea plough?

Puig et al. 2012 Nature

http://www.nature.com/nature/journal/v489/n7415/full/nature11410.html?WT.ec_id=NATURE-20120913