SEOUL, South Korea (CNN) -- Divers have found no air pockets on the third and fourth floors of the sunken ferry Sewol, South Korean authorities said Wednesday.
The announcement was made by Ko Myung-suk, the spokesman for the Joint Task Force that is leading the search.
The news all but eliminates any hopes of finding survivors on the ferry, which went down off the coast of Jindo, South Korea, last week.
More than two-thirds of those on board the ferry were students from Danwon High School in Ansan who were attending a field trip.
On Wednesday, some of their young faces stared out from photos amid a huge bank of white flowers. Plaques underneath each picture gave their names.
The dozens of photos are part of a temporary memorial to the students that opened in the gymnasium of a basketball stadium in Ansan, the city an hour's drive south from Seoul, where they went to school.
Hundreds of people filed through the gymnasium housing the memorial over the course of Wednesday morning and lunchtime, passing about 50 large wreaths on their way to the wall of flowers and pictures.
Somber music played as visitors, including friends and relatives, passed quietly among the tributes. Some people wept as pictures of the students scrolled across giant plasma screens.