The 15-year-old girls were celebrating a birthday at the escape room entertainment site in the city of Koszalin when a fire broke out next to the locked room and they died from inhaling carbon monoxide. A man who worked at the site remains hospitalized with burns.
Two white coffins and three heart-shaped urns, with the girls' photos by them, were placed before the altar during a Catholic funeral Mass in the packed St. Casimir's Church. Outside, several hundred people watched the ceremony on a huge screen.
The Rev. Wojciech Pawlak, who teaches religion in the class the girls attended, celebrated their friendship.
"In their friendship they were and will remain together. They were together when their lives were ending, they are together here and they will rest together in the cemetery. Forever," Pawlak said.
The girls, identified only by their first names as Julia, Amelia, Gosia, Karolina and Wiktoria, were later buried together at a Koszalin cemetery, to the sound of a song that one of them had written and recorded. Hundreds of residents placed white roses on their graves.
The city helped organize the funeral.
The man who ran the escape room has been arrested and charged with intentionally creating a fire danger and unintentionally causing the deaths. If convicted, he can face up to eight years in prison.
The Interior Ministry said Thursday that officials are continuing safety inspections of around 1,100 escape rooms across Poland and so far have ordered the closure of 53.
Players in escape room games are locked inside a room or building and must solve puzzles and find clues that lead them to the key that will unlock the door. The games are highly popular among teenagers in Poland.