http://www.offshore-mag.com/articles/2015/04/fugro-sets-seafloor-drill-water-depth-record.html
HOUSTON - Fugro has set a seafloor drill water depth record of 2,923 m (9,589 ft) while completing a combined sampling and piezocone penetration testing borehole to 62m (203 ft) below the seafloor.
The record was set using Fugro's Seafloor Drill 1 on a single deployment in the Walter Ridge area of the Gulf of Mexico.