A 2021 accident in Ecuador that left a tall ship temporarily pinned against a bridge and a tug capsized as it tried to help, shows us the dangers of severe river current in an emergency. And how it could happen here.
Link to video of Ecuador ship accident: https://youtu.be/05bH8_8XfNA
Image: the Brazilian Navy training ship, the Cisno Bronco. Image courtesy Wikimedia Commons.