We did it! Today we deep-towed SUESI to 5100 m deep in the Alaskan subduction zone, making this the deepest ever deep-tow of a controlled-source electromagnetic transmitter. Woohoo! Edit: the night team just pushed SUESI down to 5150 m! This beats our previous record of 5000 m set in 2010 at the Middle America Trench offshore Nicaragua.