Definitely some big ones around....came across this guy just a few days ago while night diving in the river.
By far the biggest swimmer crab I have ever seen and the video doesn't do it justice.
Mark, they are out there....the best ones we've seen (been diving every second day) have been deep but there have been plenty within 3-4 metres, which is easy without scuba.
Been seeing lots of them mating and seen heaps of females carrying eggs.