The poster below from Costa Rica has given us several excellent videos of the ROVs.

In the vid at the link, she is asking to help identify the location of the ROV, based on the lat and long shown on the screen, which obviously is not in the Gulf. She has explained that this screen has been part of the BP display of ROVs in the GOM.

Looking up those coordinates shown on the screen of her video, the location is in Turkey near the coast of the Mediterranean Sea, indicating that the sonar on the ROV screen is land-based. This made no sense until someone mentioned Lake Baikal in Russia, a little North of the Mongolia border.

OP has mentioned that there are four theaters of interest related to the organism, but did not tell us where.

Is it possible, given new information that the theaters:

Lake Baikal, Russia
Turkey
Gulf of Mexico
Arctic Ocean, which Lake Baikal empties into.

If the organism is in the Arctic Ocean, it's possible that is where the microbes originated that are eating the steel piers of ports in England.

Did the Brits dig up the frozen floor of the Gulf of Mexico to disturb the organism so that England would not be left at disadvantage of dealing with the bug while the US remained (for now) bug-free?