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The Coast Guard has gathered evidence it failed to follow its own firefighting policy during the Deepwater Horizon disaster and is investigating whether the chaotic spraying of tons of salt water by private boats contributed to sinking the ill-fated oil rig, according to interviews and documents.

Coast Guard officials told the Center for Public Integrity that the service does not have the expertise to fight an oil rig fire and that its response to the April 20 explosion may have broken the service’s own rules by failing to ensure a firefighting expert supervised the half-dozen private boats that answered the Deepwater Horizon’s distress call to fight the blaze.

An official maritime investigation led by Coast Guard Capt. Hung M. Nguyen in New Orleans is examining whether the salt water that was sprayed across the burning platform overran the ballast system that kept the rig upright, changing its weight distribution, and causing it to list.

“The joint investigation is absolutely looking into that, and whether it contributed to the sinking,” Capt. Ronald A. LaBrec, the Coast Guard’s chief spokesman, told the Center.