[RP_Joe]

There were reports that the dock people said that they had power failures at the dock while loading/unloading. If that is true, and they did not tell the pilots, that may be a problem.

In the video, there is a lot of deep black smoke. That is almost impossible with number 2 diesel.

Seems like they have probable cause to start an investigation.

[DiggyJohnson]

The black smoke on a modern ship like this can indicate emergency startup (will likely damage engine, only done to perhaps avoid knocking over a bridge), or sometimes the emergency generators.