Cliffs, terrain a big hurdle for feds in Kauai helicopter crash

Coast Guard Cutter William Hart moves toward the Na Pali Coast on the Hawaiian island of Kauai on Dec. 27. (MK3 Forest Herring/U.S. Coast Guard via AP)

This undated photo provided by the Hawaii Department of Land and Natural Resources shows an area over Na Pali Coast State Wilderness Park. There were no survivors of Thursday's Hawaii tour helicopter crash that killed a few minors and several adults, officials confirmed Saturday, Dec. 28, 2019. (Dan Dennison/Hawaii DLNR via AP)

HONOLULU — The remote and rugged terrain on the Hawaiian island of Kauai where a sightseeing helicopter crashed, killing all seven people aboard, could make it difficult or even impossible to piece together what led to the wreck.