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The ocean-going yellow sub - called Boaty McBoatyface - was being put through trials when its propeller snagged the mooring for the 1970s camera system.

The report, part of the ongoing investigation into the Baltimore bridge collapse, said that the owners of the bridges — all built over navigable waterways frequented by ocean-going vessels — “are likely unaware of their bridges’ risk of catastrophic collapse from a vessel collision and the potential need to implement countermeasures to reduce the bridges’ vulnerability.”

Topping the list: long-haul trucking, steel making, glass making, cement making, heavy cargo handling equipment, large aircraft and ocean-going vessels.

The affected area is miles from the Gulf Intracoastal Waterway, which sees frequent barge traffic, and the Houston Ship Channel, a large shipping channel for ocean-going vessels.

Unusually warm seas may also have taken a direct toll on one of the most beloved ocean-going creatures in the coldest continent, the emperor penguin.