Editing DSV Alvin (section)

===Recent overhauls===
{{See also|Ship of Theseus}}
[[File:Alvin (DSV-2) and Atlantis II(2).jpg|thumb|Mountains in the Sea Expedition, 2004.]]
Over the years, ''Alvin'' has undergone many overhauls to improve its equipment and extend its lifetime. In 2001, among other equipment, motor controllers and computer systems were added. The current ''Alvin'' is the same as the original vessel in name and general design only. All components of the vessel, including the frame and personnel sphere, have been replaced at least once. ''Alvin'' is completely disassembled every three to five years for a complete inspection.<ref>{{cite web|url=http://www.whoi.edu/page.do?pid=8422|title=Human Occupied Vehicle Alvin|publisher=Woods Hole Oceanographic Institution|year=2012|access-date=5 August 2012}}</ref> A new robotic arm was added in 2006.