Samgodson Essell, federal inmate # 95560-012, appeals the summary judgment dismissal of his complaint brought pursuant to the Federal Tort Claims Act “FTCA.” Essell alleged that while he was incarcerated in the Special Housing Unit of Three Rivers, FCI, the unit frequently flooded with raw sewage. Essell alleged that the conditions caused him injury, including the development of high blood pressure for which he must take • medication.
We review a grant of summary judgment de novo. Clark v. America’s Favorite Chicken Co., 110 F.3d 295, 296-97 (5th Cir.1997). “Summary judgment is appropriate when the record reflects that ‘there is no genuine issue as to any material fact and that the moving party is entitled to a judgment as a matter of law.’ ” Id. at 297 (citation omitted); Fed.R.CivP. 56(c). Once the moving party meets its initial burden, the burden shifts to the nonmoving party “to come forward with competent summary judgment evidence establishing the existence of a material factual dispute.” Clark, 110 F.3d at 297. The nonmovant cannot satisfy his burden by presenting unsupported allegations. Id.
The United States met its initial burden of pointing out the absence of a genuine issue for trial, and the burden shifted to Essell to come forward with competent summary judgment evidence to establish that he suffered an injury and that his injury was caused by the conditions of his confinement. See Fed.R.CivP. 56(e); Quijano v. United States, 325 F.3d 564, 567 (5th Cir.2003); Castillo v. Westwood Furniture, Inc., 25 S.W.3d 858, 862 (Tex.Ct. App.2000). Essell did not meet his burden; unsworn documents are not competent summary judgment evidence. See Fed.R.Civ.P. 56(e); Martin v. John W. Stone Oil Dist., 819 F.2d 547, 549 (5th Cir.1987).
The United States of America is immune from claims for damages based upon violations of the Eighth Amendment and is not liable for punitive damages in a tort action. See 28 U.S.C. § 2674; Martin v. Miller, 65 F.3d 434, 442 (5th Cir.1995); Johnson v. Sawyer, 47 F.3d 716, 727 (5th Cir.1995) (en banc). Accordingly, the judgment of the district court is AFFIRMED.