This XML Web Service exposes data concerning US Coast Guard Incident Investigation Reports.
The same data is available at https://cgmix.uscg.mil/IIR (through an ASP.NET Interface)

LOGICAL ORDER: Run the IIR Incident Search to retrieve the Activity Id for all other services except IIR Unit Names. To use the IIR Unit Names service, retrieve the Unit Id from either the IIR Title Information service, or the IIR Incident Brief service.

The following operations are supported. For a formal definition, please review the Service Description.