Scuba diving is often perceived as something that appears easy because those watching an experienced diver presume that all it takes is the ability to remain calm under pressure (literally) and strong swimming skills. While that is wildly inaccurate and could even prove to be deadly for an over-ambitious diver, there are some locations that even the most experienced of divers won't attempt simply on the principle of the destination alone. Not every spot in the open ocean means that diving is safe, as a diving spot needs more than water and a depth to be considered 'divable.'

THETRAVEL VIDEO OF THE DAY

Surprisingly, many of the world's most dangerous dive locations aren't even in the oven but rather in the most unassuming places, where small entrances lead to wide expanses of an underground world. Many of them haven't even been fully discovered simply due to the extreme danger and level of professional skill it would take to map them out fully. When it comes to locations that are far more dangerous than worth it, these are the ones most divers would recommend taking a pass on, lest a person risks their lives in doing so.

Jacob's Well

In Wimberly, Texas, there lies a well... but not just any type of well. This well, specifically, is underwater and goes down a depth of at least 100 feet, leading to a dark, dismal abyss that not many divers are keen on discovering. The depths below are disorienting, to say the least, but it's also a very narrow passageway which leads to the risk of being caught on the sides of the well itself.

Once a diver descends the 100 feet to the bottom, more cavernous tunnels lead them away from the well's opening, making the entire dive even more disorienting coupled by the fact that at the slightest movement, debris can be kicked up, obscuring a diver's line of sight. Eight divers have lost their lives trying to explore this well.

Cenote Esqueleto

The danger surrounding Cenote Esqueleto, also known as the 'Temple of Doom' in Mexico, is actually the lack of light. While its underwater features are not as perilous as those of underground caverns, there are certain places at the dive site where little to no light breaches the water, making it nearly impossible to figure out where you've come from or where you're going.

This means that the risk of becoming disoriented is high and with no way to decipher how to get back to the surface or the entrance of the dive site (there's no precise way it - divers are left to simply jump), many a life has been lost to the underwater confusion alone.

Related: Is Cave Diving Dangerous? These Pictures Show What It's Like

Blue Hole

The Blue Hole in Belize has attracted more people from all over the world than any other, simply due to its unique nature. The hole itself seems to just disappear and drop into a dark abyss, with the markings of its depth able to be seen from an aerial view.

As divers descend, however, many go at a rate that is far too quick for this hole's 407-foot depth. An eager drop such as this, which eventually leads down into a limestone well, can be disastrous as divers attempt to make their way back up.

Devil's Cave System

The Devil's Cave System deals divers a problem that's not depth but, rather, comes in the form of hazardous outcroppings and narrow tunnels that can wreak havoc on dive equipment.

The alluring clearness and warmth of Florida's Ginnie Springs are two things that attract divers to this site in the first place, but those who are inexperienced find out very quickly that it's rough edges and steep turns can dislodge equipment or even destroy it, leading to serious problems if they've made it too far into the cave system. These passages are also known for their strong currents as well, which can lead to unnerving and often dangerous conditions underwater.

Samaesan Hole

Samaesan Hole is the most dangerous dive site in Thailand and for more reasons than one. The hole itself descends 280 straight down and along the way, divers need to be wary of unexploded artillery that may have been left over from another era.

The site was once a dumping ground for the military, therefore divers need to be especially cautious when exploring its depths. That, combined with the strong underwater currents that have been known to push divers far off their course, make this an incredibly risky place to dive.

Eagle's Nest Sinkhole

Florida's Eagle's Nest Sinkhole has come with several warnings and is often referred to as the 'Mount Everest of diving.' The narrow tunnels take an unbelievable amount of skill to navigate and divers have no choice - they must remain calm in every situation, unless they're looking to use up their air supply before even making it to the largest underwater cavern, appropriately named the 'Grand Ballroom.'

Several divers have lost their lives attempting to reach it and it's so hazardous that signs are placed above and below the water.

Next: The Great Blue Hole: 9 Pics That Will Make Us Shudder (16 That Make Us Want To Visit)