Here is the Normand Progress entering Aberdeen in 2007. The ship is a UT 742 extremely powerful when it and its sister ship entered service in 1999, and tending to be used for pulling trenching devices. The small, and rather hazard prone structure in the centre of the channel was a small drilling rig, checking the seabed, apparently. During its quite long stay in the channel no one ran into it, although it did lose a leg when moving from one place to another.

I randomly accessed my files this morning and found the tug Herakles, which had once been a UK Emergency Towing Vessel, both with this name and an earlier one as Anglian Prince. Before that it was the Hispanic and originally the Salvageman, built in 1980. Back in those days it was a powerful vessel with 4 Rustons (pity the engineers) developing 11200 bhp. This gave it a bollard pull of 160 tons. It appears to be still at work off the coast of Denmark. 

At 0500 on March12th 2016 the tug Specialist collided with a construction barge and sank almost immediately with the loss of three lives. The accident was investigated by the American National Transportation Safety Board and their report was published on May 11th 2017.

 
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