NOTES: This table does not include ROVs or AUVs. DSVs in bold italics were developed by U.S. Navy. This table does not include one-off and backyard submersibles. The line between inactive and retired is not precise. In general, inactive refers to DSVs that can be put back into service without excessive restoration. Retired designates submersibles that cannot be put back into service, have been given to museums, junked, or are similarly unavailable. During years with dashes, no DSVs were put into service. The submersibles listed were built in the United States and worked at least part of their lives for U.S. companies. Not included are DSVs built by U.S. companies (primarily Perry) and exported or foreign-built DSVs now used by U.S. companies.