Extreme Cave Diving (NOVA): Extreme Cave Diving follows the charismatic Dr. Kenny Broad as he dives into blue holes-underwater caves that formed during the last ice age when sea level was nearly 400 feet below what it is today. They are Earths least explored and perhaps... (more details for Extreme Cave Diving (NOVA))

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File by Catherine Tejnecky (#2851)
2015-05-23 Grade: 11-12