The bodies of two men, the third and fourth discovered so far, were found by search-and-rescue teams in the second and third garage of the "Euroferry Olympia" on Thursday.
The burnt-out passenger-car ferry was towed to the port of Astakos in Etoloakarnania on Wednesday. The discovery of the bodies raises the number of confirmed dead to four, the number rescued to 281.
Rescue workers are continuing to search the interior of the ferry, while the garage doors will open once the level of carbon dioxide within the vessel has dropped and there is no risk of fires rekindling.
The "Euroferry Olympia" caught fire on the third deck early on Friday, February 18 while it was sailing northeast of the island of Ereikoussa on its way from Igoumenitsa to Brindisi.