I wanted to post this article I found. It is pretty interesting. I’ve never heard of sink holes in the bottom of the Great Lakes, but apparently they exists. Here is a quick snippet of the article. The link to the full article is below.

Robert Ballard, discoverer of the sunken Titanic, and a team of researchers set out in 2001 to map shipwrecks offshore of Michigan in Lake Huron’s Thunder Bay National Marine Sanctuary. A geologist by training, Ballard took notice when imagery from the team’s side-scan sonar revealed dozens of large depressions in the lakebed.

Upon further inspection, the depressions proved to be sinkholes. Researchers were surprised to find some of them teeming with brilliant purple bacteria and other peculiar, seemingly primitive organisms (see March Bay View Compass). Similar life forms previously had been found only in extreme places like the deep sea and Antarctica.

Full Article:
Land, Lakes Linked Underground by Sinkholes

Dive Safe,
Duane
Precision Diving

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