In the late 1960's there were two ways to walk home from school. Each held its own terrors for a 10 year old. The first more conventional Marathon Steps (200m SSW of GZ) which ascended the hill with an ancient stairway under creaking massive sandstone blocks which overhang and defy gravity as they succumb to soil creep, threatening to topple and crush the innocent walker, I would sprint up them in a panic each time convinced that THIS was the day they would finally fall and crush me!
The other way home was even more terrifying. WALK THE PIPE!. From GZ the pipe can be still be seen just over the sandstone wall in the water. The method was to jump the wall, mount the large pipe and walk its length in a northerly direction for 100m. This will take you to swimming pool area of an exclusive , redbrick waterfront apartment building on Sutherland Crescent. From here we would enter the building (nothing was locked backed then), call the lift, push the button and emerge at the main entrance on Sutherland Crescent. From there it was only a 2 minute walk to our house. Needless to say, at high tide and on windy afternoons the harbour chop would pound the pipe and wet shoes and socks were often the outcome. The pipe was slippery and wet and posed a very real threat of total immersion or even drowning if you were not sure-footed!
Go ahead! Try it! The pipe is actually part of the harbour and thus walking it to this day is still possible without breaking any rules. Of course, don't try to negotiate the last leg through the apartment block as today you would probably be hauled off by the police for trespassing.