Do you know some or all of these?  Here is the number 4 mystery shown in the video:

4) The Bloop

In 1997, multiple underwater microphones known as hydrophones picked up an extremely loud sound across a range of over 3000 miles. The sound was given the name “The Bloop.” The audio profile of the sound does resemble that of a living creature, except for the fact that it was many times louder than that of the loudest known creature, the blue whale….leaving the possibility open that a creature could exist much larger or at the very least louder than the blue whale. Others hypothesize that the sound was actually caused by a large icequake in Antartica…but the true source remains unknown.

We hope you enjoy the video.  Do you think any or all of these have some merit?

Feel free to comment with your theories and check back as new archaeological updates come out about these prehistoric mysteries.