But then you're still, and it's colder than ice cubes freezing in your refrigerator because salt water has to be colder to freeze." Fortunately, she survived the iceberg. The post Cave Diver ...

"I was the first to cave dive inside an iceberg, so we had no idea what we might encounter. We experienced calving [chunks of ice breaking away] that blocked the doorway we had entered. We ...

Follow a fearless team of scientists as they venture into blue holes—underwater caves that formed during the last ice age, when sea level was nearly 400 feet below what it is today. These caves ...