In December 2018, he became the first person to reach the deepest point of the Atlantic Ocean, piloting DSV Limiting Factor, a reported US$50 million submarine system (Triton 36000/2) – including its support ship the DSSV Pressure Drop and its three ultra-deep-sea robotic landers – 8376 meters below the ocean surface to the base of the Puerto Rico Trench, an area subsequently referred to by world media as Brownson Deep.