On 12 June 1942, "Nestor" sailed from Haifa as part of the large escort force for Operation Vigorous; a Malta Convoy consisting of 11 merchant ships carrying food, fuel, and supplies for the besieged island. Air harassment of the convoy began almost immediately after leaving port. During the afternoon of 15 June, the convoy received word that a second convoy (Operation Harpoon) sailing from the west had successfully arrived, and based on the quantity of air attacks and intelligence that an Italian fleet was in the area, it was decided to return the "Vigorous" convoy to Alexandria.