Ok bob , unfortantly I never made it to hook reef pnly to Bait reef which is the closest reef to Airlie beach .....
Bait is a small atoll with a large extending reef out to the south.....the entrance is by means of a orange/green/dirty float....the original cardinal marker is laying 10 mtrs below the water damaged and not replaced from past cyclones.
So when you enter make sure you keep that float to your starboard as this mark is the start of a line of 12 bommies running roughly south..... Once you enter there are 5 public mornings.
The water is deep and clear inside the atoll at 10 Mtrs. If you are keen for a dip you can tie your tender of on the entrance float and snorkel over and around the first bommies providing no other boats are on the approach. Try to snorkel on slack tides as there can be a bit of ripping around the bommies mostly on the seaward side,inside the atoll it's mostly up and down movement.
I have spent many magic nights and days out there....and dived all the bommies... It's truly amazing place 2nd best from lizard island and ribbons.