sentence1: In 1986 he joined forces with Edgeworth David to work together on the ANARE expedition that established the Sir Erich A. Colhoun summer field base in the Bunger Hills .
sentence2: In 1986 , he joined Edgeworth David to work together on the ANARE expedition that founded the summer field base of Sir Erich A. Colhoun in the Bunger Hills .