The real "Bugsier 2" is a multi-purpose tug. Normally they use it in Hamburg for towage, but she leaves her homeport sometimes for salvage jobs along the river Elbe and off the German coast and for long distance towages. Last year she was in St. Petersburg/RUS for such a job and that's the reason, why the tug has a higher forcastle than most of the other harbour tugs to improve her seagoing means. "B2" could be used as anchor handler too, therefor she has a special door at her stern, but as far as I know, they didn't used it until now.
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