Welcome to the dungeon-crawler of OMSI 2, KamaBus... Tettau's lines 8342 and 8343, successfully explored with KamaBus's #9955 (a 1983 Mercedes-Benz O 307, part of the 9955-9969 series)!
Mercedes-Benz O 307 v2 (rollband version) | Tettau, lines 8342 and 8343 | KamaBus DB 21-3G22 (test, not for release)