Chartered swimming with humpback whales is currently undergoing a 5 year trial. This trial began in 2016 and has allowed about 10k divers to experience diving with these magnificent whales without incident.
I guess, if it is thinkable it is possible. One report indicates that others were injured as well. This is very unusual news as it has been demonstrated on many occasions how gentle and friendly whales are to divers.
Perhaps they were diving too close as the whales were traveling through. Who knows, but an investigation is underway.
Watch the following video below for more details.
Imaegs Source: YouTube Clips
You an also read for more details here on news.com.au