This was a very difficult book to obtain. There was a copy in the British Library, and another one in a Library in Dartmouth, Devon. For several years I tried at least weekly to find a copy via Abebooks or eBay, with no success. The copy belonging to the Ballantyne family had disappeared, not to put too fine a point on it. Eventually a kind family in Canada offered to scan the pages of their copy, and send the images to me, and this is the result. Ballantyne did indeed try out some diving equipment, so as to obtain a first-hand feel for diving. It is related that something went wrong, too much air was sent down, and he surfaced rapidly upside down. A similar episode is related in the b…
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