Underwater video footage shows one occupant visible in the wreckage of the plane which was carrying Cardiff City footballer Emiliano Sala, the Air Accidents Investigation Branch said.
The wreckage of the plane which was carrying the footballer was found in the English Channel on Sunday morning after almost two weeks.
A private underwater search team located the aircraft and informed the families of Sala and pilot David Ibbotson.
David Mearns, who led the privately-funded search, confirmed the plane was identified by sonar off Guernsey at around 9am on Sunday.
AAIB officials arrived at the site to inspect the wreckage and have now issued a statement.