The Bloop

In 1997, a loud and powerful sound was detected and heart by the U.S (NOAA). The sound was traced to a remote point in the south Pacific Ocean.

According to the description provided by the NOAA, it had rised rapidly in frequence for about one minute, and was able to be heard at over 5,000m.

Dr. Christopher Fox of NOAA has said he does not believe its origin is man-made. Although the sound resembles a living creature, the sound is several times louder than the blue whale, which is the loudest recorded animal.

Fox then later stated that the Bloop could be ice calving in Antarctica. A year later, a journalist called David Wolman, made her own opinion on the origins of the sound:

"Fox's hunch is that the sound nicknamed Bloop is the most likely to come from some sort of animal, because its signature is a rapid variation in frequency similar to that of sounds known to be made by marine beasts. There's one crucial difference, however: in 1997 Bloop was detected by sensors up to 4800 kilometres apart. That means it must be far louder than any whale noise, or any other animal noise for that matter. Is it even remotely possible that some creature bigger than any whale is lurking in the ocean depths? Or, perhaps more likely, something that is much more efficient at making sound?

— David Wolman"

Many people interested in the bloop have stated that they believe the origin of the sound to be related to Lovecraft's work.

Below is a video about the bloop.

Devil's Footprints

An intriguing case of the Paranormal is that of the Devil's Footprints. The name was given to the phenomenon that happened during February 1855 in South Devon, England. Shortly after the occurring of a heavy snowfall, mysterious hoof-like marks appeared overnight in the snow,  and covered a total distance of 40-100 miles. The footprints were called this because many believed these were the tracks of Satan.

The hoof marks mostly measured to be around 4 inches long, three across, and between eight and sixteen inches apart, and usually in a single file. They had been reported from over thirty different places across Devon and some in Dorset.

An particularly interesting thing about these tracks is that all obstacles including houses, rivers and haystacks were traveled straight over, and there were footprints appearing on top of the snow-covered roofs and even walls that lay in the path of the footprints.

There had also been rumors of 'sightings'.

Apparently, a few people had seen a "devil-like figure" in the Devon area during the incident.

Primary and Secondary source material of evidence has been collated by a noted researcher Mike Dash into a paper entitled: The Devil's Hoofmarks: Source Material on the Great Devon Mystery of 1855, and was published
in Fortean Studies in 1994.

Many theories have been concluded to explain this incident.
The suggestion of "an experimental balloon" was one, which
was apparently released by mistake from Devonport
Dockyard, and had been trailing 2 shackles on the end of it.

Although many theories have been created to explain this
situation, what in fact did make these prints still remains a
mystery.

Source: The Devils Hoofmarks