Cave Diver Trapped Alone in the Dark

A video on YouTube. In True Crime & Mysteries, a Krater category.

Summary by Krater

Three stories about fatal cave exploration incidents detail how hikers and divers lost their lives in lava tubes and flooded cave systems due to oxygen deprivation, gas buildup, lack of training, and extreme constriction.

From the video

Answers: What are the stories of dangerous cave diving and exploration accidents?

Cave exploration
Lava tubes
Cave diving accidents
Oxygen deprivation
Gas buildup
Rescue operations

What it concludes

Hikers entering unvented lava tubes on Tenerife suffered mass asphyxiation and death due to oxygen deprivation from accumulated volcanic gases.
Divers entering Nickajack Cave without cave diving certification or guide ropes encountered poor visibility, silt disturbance, and air depletion leading to fatalities.
An arterial gas embolism caused by holding breath on ascent from cave depths is a fatal hazard for divers.

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