Searching for sunken treasure? The Long Island Sound is hardly the place to look.

But what can be found in its murky waters are ample remains of Connecticut's once prominent shipping industry, and perhaps evidence of early Native American villages from around 20,000 years ago when the Sound was a glacial lake.

Today, we survey shipwrecks and other bits of history resting off Connecticut's coast, as well as at the bottom of some lakes and rivers.

From dugout canoes and mastodon molars to the more than two dozen ships set ablaze in Essex harbor during the War of 1812, it's an underwater adventure not to be missed.