3 day after the tanker Exxon Valdez arrived to offload the remaining oil from the stranded tanker .
On 4 April offloading was completed and the next day the Exxon Valdes was refloated and towed to a sheltered harbor for repairs.
Meanwhile the oil slick spread rapidly within the sheltered sound
and the prevailing current took oil through the Montague Strait and within 6 days the oil had begun to spread into the Gulf of AlasKa .