Garbage collector of canals

The Amsterdam canals are beautiful but to keep them that way, they need a lot of maintenance. For instance: the garbage needs to be removed. We're not just talking about paper or plastic waste...no, this is about using two, large barges, one with a krane with claw mounted on top, and picking up all the sad 'little' shipwrecks, partly or completely sunk, which can be found all along the canals.
This means that, sometimes, they have to scrape the bottom to look for a boat that has 'disappeared'. Usually the grip comes back up, holding a few, rusty, bicycles.
Here's this morning's evidence.

On the way to pick up

and back again, a few wrecks richer

It's very well organised and documented. Pictures are taken as proof of the state the wreck was in, before they're removed and lists of those boats + location are placed on the internet, weeks in advance.
Here's an AT5 article about it: WRECK-REMOVAL