Max Gleeson, author of several excellent books on NSW shipwrecks, and the Yongala, and cinematographer, has kindly made available online a video of the NAUI Helmet Diving Course held in Portland, Victoria.
https://www.historicaldivingsociety.com.au/wp-content/uploads/2016/11/HardHatVideo.jpg6021200Allan Kesslerhttp://www.historicaldivingsociety.com.au/wp-content/uploads/2016/11/HistoricalDivingSocietyLogo2.pngAllan Kessler2016-11-30 02:25:052017-01-14 06:40:44Helmet Diving Video