In the lake near The Baelfire it’s possible to access an underwater area that allows you to swim under the whole of Fireheart Rise. It is then possible to attack the Giant Undersea Wurm event from beneath the wurm and as far as i can tell the wurm doesn’t appear to be able to hit back very effectively. This allows easy completion/farming of the event and looting. Also the Broodmother event can be done from this position.