sentences:  A couple of weeks later, in mid-August, the ship departed south-eastward, anchoring at Hilo Bay off Hawaii's Big Island, before continuing to the south and reaching Tahiti in mid-September.The expedition left Tahiti in early October, swinging to the west and south of the Tubuai Islands and then heading to the south-east before turning east towards the South American coast.The route touched at the Juan Fernández Islands in mid-November 1875, with "Challenger" reaching the port of Valparaiso in Chile a few days later.