Seventh and final Plowshares member sentenced to prison for nuclear base break-in Mark Colville was part of the Kings Bay Plowshares 7 who broke into a naval base on April 4, 2018. DePaul University in Chicago announced last month it would recognize the group with a Christian nonviolence award. The Kings Bay Plowshares 7. From left to right: Elizabeth McAlister, Stephen Kelly, Carmen Trotta, Mark Colville, Martha Hennessy, Clare Grady and Patrick O’Neill. Photo courtesy of the Kings Bay Plowshares 7 April 9, 2021 (RNS) — The seventh and final Catholic peace activist, who three years ago broke into the King’s Bay Naval Base in Georgia to symbolically disarm its stockpile of nuclear weapons, was sentenced Friday (April 9) to 21 months in prison.