Underwater rescue teams are working night and day to try to get inside parts of the sunken South Korean ferry, the Sewol. It’s now five days since the passenger ship capsized on Wednesday morning with 476 people on board.... and the hopes of finding any survivors are extremely remote.

Authorities say they’re deploying four new guiding cables on Monday, to guide divers through rapid currents to the ferry’s underwater gate. A sonar detector will also be used to search for bodies that may have been washed away. Operations are expected to pick up speed on Monday, with more favorable weather conditions expected.

204 ships, 34 planes and 563 divers took part in the operation on Sunday. Coast Guard, Navy and private divers have been entering the hull through five separate guiding routes to search for bodies and possible survivors. Meanwhile, the South Korean Navy confirmed on Sunday that one of its divers died from brain injuries during the search operation.

The government has designated the site of the tragic ferry accident as a special disaster zone to allow the government to provide victims and relatives with rapid assistance.