Dive #19: North Head, Sydney, Australia.

Place:North Head (The Blocks) Buddy:Eithne
Weather: Type:Boat (Sea Life V)
Max. depth (m):25.9 Visibility (m):10
Time down:14:09 Dive time (mins):25
Average depth (m):0.0 Water temp. (C):0.0

Equipment: As #17.

Notes: PADI advanced course dive 4/5, “Deep Dive”. Instructor demonstrated (i) colour dissipation under water (red almost gone at 25 m) and (ii) mental impairment at depth – the time to complete a simple mental task (picking out numbers from a grid in order) was measured at the surface and at 25 m. It took marginally longer at depth. Air is used at a rate proportional to depth.

Accumulated time under water: 8 hrs 49 mins

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