From the London Mail [caution, lurid tabloid]:
The infamous ‘Route 666’ bus service to the Polish seaside resort is being resurrected by Flixbus – three years after it was renumbered due to pressure from religious groups. The 13-hour route links Kraków and Hel, with stops in major Polish hubs like Władysławowo, Kuźnica and the capital, Warsaw.
The route gets its name from a mix of its destination, Hel (similar to the English word ‘hell’), and bus number 666, the biblical number of the beast. Although the service ran for over a decade, the number was ultimately retired and replaced with ‘669’ in June 2023 following years of complaints from Catholic conservative groups, who called it ‘satanic’ and ‘anti-Christian propaganda’.