 Lindberg made a documentary while he was a volunteer sealing inspector on the vessel "Harmoni".The documentary, "Seal Mourning", had its premiere on the Norwegian television station NRK on 9 February 1989, when the channel showed clips from the film.The negative attention Lindberg received from both seal hunters and the Norwegian government, as well as the public at large, was eventually so intense that he chose to move out of the country and settled abroad, in Sweden, with his wife and two children; he later moved back to Norway.