The school students went on an excursion through a cave system.

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Sources - 

https://cavesaustralia.caves.org.au/archive/v107161/ac_126.pdf

https://www.abc.net.au/news/2016-02-16/the-hidden-underworld-tasmanias-cave-history/7084386?nw=0

https://www.newspapers.com/newspage/121384181/

The Sydney Morning Herald (Sydney, NSW, Australia) - 4 July 1990 Page 1 * 13 Oct 1990 Page 9 * 20 Oct 1990 Page 71 * 20 Oct 1990 Page 73

The Age (Melbourne, Victoria, Australia) - 15 July 1990 Page 6 * 26 Sept 1990 Page 3 * 28 Sept 1990 Page 4 * 5 Oct 1990 Page 6 * 6 Oct 1990 Page 12 * 20 Oct 1990 Page 24