In early 2014 , an extensively refitted '' Alvin '' started verification testing in the Gulf of Mexico . Featuring new cameras , lighting , and a larger titanium personnel sphere , this new '' Alvin '' is the result of a three-and-a-half year effort to bring the sub to new depths . In March and April 2014 , '' Alvin '' was used to explore the site of the 2010 Deepwater Horizon oil spill
Deepwater Horizon oil spill
Deepwater Horizon oil spill
DSV Alvin