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Here I have annotated the important elements. The red outlines the fiberglass support bonded to the bottom of the tank. Blue arrow points to the blue crack. The crack formed exactly as a stress analysis says it should, at 45º to the corner of that supp

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In this view fore is down, aft is up, port to the right and starboard to the left.

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The crack as viewed from the top side.

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Standing on the port side looking down into the tank. The leak is that blue line with the lighter blue background.

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The crack as viewed from the underside. it is about 1 5/8 in (4 cm) long and 1/32 in (1 mm) wide. Notice the blue staining on the underside surface.