St Michael's Mount replacing the pack horses which had previously been used. Its steep gradient renders it unsafe for passenger-use, thus The National Trust has made it out-of-bounds for public access. The causeway between the mount and Marazion was improved in 1879 by raising it by with sand and stones from the surrounding area. Repairs were completed in March 2016 following damage from the 2014 winter storms. Some studies indicate that any rise in ocean waters as well as existing natural erosion would put some of the Cornwall coast at risk, including St. Michael's Mount. Until recent times both the mount and the
NOAAS Mount Mitchell (S 222) commissioned into the Coast and Geodetic Survey in March 1968 as USC&GS "Mount Mitchell" (MSS 22). When the Survey merged with other organizations to form NOAA in 1970, she became part of the NOAA fleet as NOAAS "Mount Mitchell" (S 222). She is the sister ship of and , which are both still in service with NOAA. "Mount Mitchell" operated as a multipurpose vessel. She had an oceanographic laboratory, several echosounders, and an oceanographic winch. She also had a hydroplot data-processing system, as did two of her survey launches. "Mount Mitchell" conducted hydrographic surveys on the United States East Coast