Did an early morning mid-week dive under Mordialloc Pier recently. Perfect weather conditions. Clear water, great viz.
But there's just one issue - there's really nothing to see under the pier.
A couple of shopping trolleys, remnants of a concrete park bench, but that's about it. Very little marine life. There are a few rocky outcrops near the beginning of the pier, but other than that...
I did find a near new fishing rod, which was donated to a kid (and his dad) on the pier. The kid couldn't believe his luck!)
Water temp 22 deg, viz 15 metres, dive time 45 mins.
So now you won't need to waste your time diving at Mordialloc Pier - you can watch it in 4K instead.
You're welcome.