Not an unusual thing for the Elbe to do:
See attached link
http://www.maritimejournal.com/archive101/2004/november/tugs__and__towing/double_trouble_for_the_historic_elbe
Wow. If she sinks a third time they should take serious action, If (God forbid) She sinks a fourth times, They should Drydock her. Or do something like they did to the Ticonderoga, (Turn her into a museum) Like this: