hey guys, hopefully someone can help me out with this one - a teacher read this book to us in primary school (took weeks to read so it was substantial in length). it was about some children in the modern day in Sydney that stumble onto a cave of some sort. the story is connected to some historical ship 150(?) years ago. i seem to remember a lot of nursing/hospital scenes for the older timeline. there are a lot of uses of parallels between the timelines.
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