SOURCE: Don Walsh, International Maritime, Inc.

^a U.S. Navy submersibles primarily support Navy missions; however, significant amounts of time are provided to the U.S. marine science community each year.

^b Because of uncertain economic conditions in Russia, few operations are being conducted at present. Several of these submersibles have been offered for sale.

^c Because of uncertain economic conditions in Ukraine, few operations are being conducted at present. Several of these submersibles have been offered for sale.

^d Saga is currently in storage. The SO-450 will be used in French Polynesia for scientific and commercial operations.

^e The operational status of these submersibles is unknown because of uncertain economic conditions in Romania.

^f This Kordi submersible was built in Korea and is currently inactive.

^g Because of uncertain economic conditions in Bulgaria, this submersible is believed to be inactive.