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Overhead Environments: Cave vs. Advanced Wreck

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By John Bentley

Being underwater is a ton of fun. Being inside things that are under water can be even more fun. Seeing the galley or crew quarters inside of a World War II-era shipwreck, or unique clay banks deep inside an underwater cave is an awesome experience.

The risk of not having a direct ascent is the same regardless of the environment. A simple problem that’s easily remedied in open water can be a serious problem when inside a structure, cave or wreck. Let’s take a look at what sets these environments apart.

Hazards

Caves and wrecks offer the same general hazards for the scuba diver: That is, no direct access to the surface, crucial navigation and gas planning requirements.

Wrecks are more notorious for the hazards of rust, fishing line and cables. These entanglement and entrapment hazards are unique to wrecks as they deteriorate significantly faster than most cave environments.

Caves are not safer for entanglement and entrapment hazards though. While fishing line and cables don’t pose a risk in most caves, cave rock can be extremely sharp in some parts of the world, and being stuck against solid rock is less forgiving than rusted metal.

Distance

A major difference in cave and wreck environments is the distance traveled. It’s not uncommon for a cave diver to swim 600 m/2,000 ft into a cave system, a round trip of 1,200 m/4,000 ft. Wreck penetrations, even the long ones, are typically much shorter. Longer wreck penetrations off more twists and turns than typical cave dives, as sunken ships aren’t conduits for waterflow, they’re conduits for people flow and storage.

Logistics

There are cave dives that require boats and wreck dives that are shore entries. Cave dives that are comfortably warm and frigid cold wrecks. Both can offer current, deep depths and even wildlife interactions. Some caves require proficient line work and dry caving skills. With all that in mind it’s fair to call the wrecks and caves equal in terms of harshness of logistics.

To line or not to line?

A diver can get lost in both caves and wrecks. Navigating in zero visibility or crystal clear-water without a reference is not a situation any diver wants to be in. Using a guideline properly is the best method for a “no thought” process of exiting overhead. Proper guideline use includes where to run the line, but more importantly, where not to run the line. Avoiding line traps, awkward following paths and sharp metal ensure that the line can be followed in zero visibility. That is the entire point of running line.

Wrecks typically have closer and more plentiful exits, which is why it’s popular to not run line as often. Many wreck penetrations are just long swim throughs, with a clear exit on the other end. An experienced wreck or cave diver will tell you without hesitation that you never trust an exit unless its verified.

So, what’s the take away? While one is gnarly twisted metal and the other ancient worn rocks, both environments offer similar hazards. They both are well worth the training to experience, and can stun divers with challenges and views.

Are you ready to move into to cave or advanced wreck diving? Check our Intro Cave Course here and our Advanced Wreck Diving Course here!


To find out more about International Training, visit www.tdisdi.com.

From its humble beginning in 1994 to today, the group of training agencies Scuba Diving International (SDI), Technical Diving International (TDI), and Emergency Response Diving International (ERDI) form one of the largest diving certification agencies in the World – International Training. With 24 Regional Offices servicing more than 100 countries, the company today far exceeds the original vision the founders had when they conceived the idea on a napkin, sitting at a kitchen table in the early 1990’s.

Dive Training Blogs

Join Me On My Commute To Scuba Diving Key Largo! (Watch Video)

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Sunrise was so beautiful the other morning, I wanted to take a time lapse of my drive from home in South Miami to Key Largo before morning dives with Horizon Divers.

I thought you might enjoy taking the ride with me! Silly I know! But here’s 2 minutes of chill!

D.S.D.O,

James


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Dive Training Blogs

Ten Sensational Spots to Snorkel or Learn to Dive!

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A guest blog by PADI

Snorkeling has long been a beloved way to explore the underwater world. With vibrant coral gardens, large schools of fish and a vast underwater topography to explore, snorkel excursions are a great way to experience both your own backyard and create memorable holiday memories to last a lifetime.

But often these sensational snorkel spots are an equally a great place to make your first ocean dives. Whether you participate in a PADI Discover Scuba Diving experience or take the PADI Open Water Diver course to become a certified diver, you’ll be guided by a trained PADI® Professional who will be looking out for you the entire time as you take your first breaths under the ocean. This experience allows you to have an intimate connection with the location you are exploring as, oftentimes, you will have the opportunity to see even more marine life than you would from the surface of the water.

To help you plan your next ocean adventure— whether it be down the road or on your next overseas adventure (whenever that may be!) —we have rounded up ten sensational spots where you can both snorkel and learn to scuba dive!

  1. Kohala Coast, Kaanapali, Maui, USA

Not only does Hawaii come with beautiful scenery above water, but the island chain equally boasts some of the most incredible underwater landscapes in America. One of the best places to experience this is along the Kohala Coast in Kaanapali, Maui—whose calm and clear waters make it a favorite spot amongst snorkelers. But it makes for an equally exceptional scuba experience, where you will get to do either do a boat or shore dive and get amongst the turtles, tropical fish and dramatic underwater landscapes.

Photo Credit: PADI

  1. Great Barrier Reef, Queensland, Australia

Be delighted by one of Australia’s most beloved underwater gems—the Great Barrier Reef. Featuring a rainbow of colorful coral gardens and hundreds of tropical fish species, there is plenty to explore here. It is an ideal spot for groups that want varied experiences as tour operators can cater for those that want to snorkel, those that want to learn to dive and those that are already PADI certified. And when you’re not in the water you will get an enriching reef talk where the experts, who will take you though ways in which you can play a part in conserving the reef system.

  1. Sharks Bay, Sharm-El-Sheikh, Egypt

For those that don’t want to spend the whole day out on a boat but still want to have a memorable experience on the Red Sea, Sharks Bay in Sharm-El-Sheikh is a great option. With stunning house reefs and wrecks in a marine protected area, the colorful underwater experience is beloved by both those that snorkel or do a discover scuba through the area. The boat ride to the house reef is a short one and the memories will certainly last you a lifetime.

Photo Credit: PADI

  1. Poor Knights Island, Northland, New Zealand

Have the perfect day out at one of New Zealand’s first marine reserves. Dubbed by Jacques Cousteau as one of the top 10 dive sites in the world, Poor Knights Island offers something for everyone. You can easily spend hours swimming through the dense kelp forests and archways full of fish! And in between snorkels you can sign yourself up for a PADI Discover Scuba® Diving experience, where the chances are high you will encounter nudibranchs, long-tailed stingrays, devil rays, sea turtles and even an occasional orca!

  1. Stingray City, Grand Cayman, Cayman Islands

With unique marine life and spectacular underwater topography, Stingray City in Grand Cayman is a stunning spot to explore the ocean. It is famous for the large of stingrays that come through in search of a meal and offers water enthusiasts a special encounter with them. Those lucky enough may even get a kiss on the lips from these friendly sea creatures. Whether you are snorkeling or doing a discover scuba experience here, make sure you also have your camera in hand, as this spot is extremely photogenic and you’ll want a keepsake of you and your new underwater friends.

Photo Credit: PADI

  1. Great Astrolabe Reef, Kadavu, Fiji

One of the most intimate places to snorkel and also have your first diving experience is in the Great Astrolabe Reef. A few seconds underwater and you will quickly discover why Fiji is regarded as the soft coral capital of the world. It is a great spot to have your “Finding Nemo” moment and chances are high that you will also see manta rays and resident white tip reef sharks while you’re in the crystal-clear warm waters. With only small groups exploring the reef at a time, it is the perfect spot to have a special moment amidst the pristine nature.

  1. John Pennekamp Coral Reef State Park, Key Largo, Florida, USA

With this state fully re-open for business (at the time of writing), ditch the crowded amusement parks and beaches for Florida’s underwater park at the John Pennekamp Coral Reef State Park, which was the first of its kind in America! What makes this an equally great place to snorkel and learn to dive are the shallow waters that have an immense landscape for you to explore. You’ll see abundant sea life with over 650 types of fish, 40 types of living coral the famed 12-foot submerged statue of Jesus.

  1. The Blue Hole, Gozo, Malta

Whether you are snorkeling or diving for the first time in Malta, taking a giant stride into their blue hole is a must-do bucket list item. It’s no surprise this is a favorite spot amongst ocean lovers, as Jacques Cousteau rated this spot one of the best in all of Europe. Be amazed as you watch the natural light rays bounce off the beautiful reef—illuminating the unique topography of the area. For those that try a dive here, it will certainly set standards high for future dives to come!

Photo Credit: Manuel Bustelo

  1. Robberg Nature Reserve, Plettenburg Bay, South Africa

What’s cooler than snorkeling with seals? Diving with them! Plettenburg Bay in the Western Cape is home to some of the friendliest seals who are keen to play all day long. Sign up to snorkel with them for the day during an ocean excursion or do a discover scuba experience— where you learn to dive in the pool first and then head to the ocean to find your furry friends! Either way, it is only a short boat ride out to find the seals, meaning you’ll have plenty of time to play with them in their natural habitat.

  1. Crag-y-Mor, Wales, United Kingdom

Explore the cooler (literally) places in Wales by going on an underwater snorkeling or diving adventure! There are both half-day snorkeling and diving trips that give you a new perspective of the coastline—where both seals and historical ruins are in abundance. While there are magical marine life encounters in these waters all year long, summer offers a chance to see the water sparkle from both moon and blue jellyfish. And if you’re lucky enough, you’ll swim passed walls that are covered in red sea squirts!

Photo Credit: PADI

Ready to dive in? Visit padi.com or contact a PADI Dive Center or Resort to start planning your snorkel or scuba trip!

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Competitions

Explore the amazing triangle of Red Sea Reefs - The Brothers, Daedalus and Elphinstone on board the brand new liveaboard Big Blue.  With an option to add on a week at Roots Red Sea before or after. 

Strong currents and deep blue water are the catalysts that bring the pelagic species flocking to these reefs. The reefs themselves provide exquisite homes for a multitude of marine life.  The wafting soft corals are adorned with thousands of colourful fish. The gorgonian fans and hard corals provide magnificent back drops, all being patrolled by the reef’s predatory species.

£1475 per person based on double occupancy.  Soft all inclusive board basis, buffet meals with snacks, tea and coffee always available.  Add a week on at Roots Red Sea Resort before or after the liveaboard for just £725pp.  Flights and transfers are included.  See our brochure linked above for the full itinerary.

This trip will be hosted by The Scuba Place.  Come Dive with Us!

Call 020 3515 9955 or email john@thescubaplace.co.uk

www.thescubaplace.co.uk

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