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This has never happened before on the Moselle: dam beams, actually used to drain locks for inspection and repair purposes, make it possible to lock at the Müden lock despite the lower gate being destroyed. The large motor freight ship GMS "Allegria" was the first ship to be locked in emergency operation. The skipper steered his 80 m long, loaded ship into the chamber extremely carefully and slowly. Depending on the draft of the ship to be locked, seven, eight or all nine of the nine steel beams are lifted out by crane to release the ship into the underwater water. Immediately after exiting, the dam beams are reinserted one by one. On December 8th, a ship drove almost unbraked into the lower gate of the Müden Moselle lock, ripping both gate wings out of their anchorage. The lock was then no longer usable. Over 70 ships were backed up on the Moselle and Saar. Just one week later, on December 16, the Mosel-Saar-Lahn Waterways and Shipping Office had the solution ready. After a detailed assessment of the damage, intensive planning and several tests, dam beams replaced the gate, which had since been removed. They are installed and removed manually and with the help of a crane, a laborious task for each lock. In this way, seven ships, including a push convoy that had to be split, were able to be locked through eight locks towards the Rhine on the first day. The following day, two pairs of dam beams connected to one another accelerated the process. This means that between eight and nine vehicles can be locked in 24 hours - significantly more than initially estimated.