UConn marine scientist David Lund and his colleagues studied hydrothermal activity along the mid-ocean ridge system – the longest mountain range in the world, which extends some 37,000 miles along the ocean floor and found a link between hydrothermal activity and glacial cycles.
http://today.uconn.edu/2016/01/activity-on-seafloor-linked-to-icy-ebb-and-flow-on-surface/