discussed Cited "see" United States v. Michael R. Raven See Hickman v. Taylor, 3 Cir., 1948, 170 F.2d 327, 329 , cert. den., 336 U.S. 906 , 69 S.Ct. 485 , 93 L.Ed. 1071, 1949 , where the Court in dicta recognized that the failure to mark a sunken but intact carfloat that later resurfaced violated § 409. 9 .