By Alvin Alexander. Last updated: January 31, 2018
Yesterday a nurse told me about a Human Occupied Vehicle named Alvin. which, among many other things, made twelve voyages to the Titanic. You can read the basics here, and more here at noaa.org.
A quote from the first article: “Currently rated to 4,500m, which gives researchers in-person access to about 2/3 of the ocean floor, the most recent upgrade increased the depth rating of many of the vehicle’s systems, making it just steps away from having a depth rating of 6,500m, or approximately 98% of the seafloor.”