The world’s seafloor is largely undiscovered, which is why Larry Mayer, director of UNH’s renowned Center for Coastal and Ocean Mapping, continues to explore it.
https://www.youtube.com/watch?v=BFDZLkSMB2g&list=PLS2BDT4XMseaSypQ0liSA4EQZbWG1_gee&t=1s&index=10