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Explore Hranice Abyss in 3D – the world’s deepest flooded freshwater abyss



There are some places that few have seen or are yet to be discovered in the Czech Republic. They are hidden underground, created by water over millions of years… gorges, stalactite domes, canyons. Now, thanks to virtual reality and divers’ video recordings, the public has the opportunity to dive into the deep and explore the Hranice Abyss in 3D.

The popularity of the Hranice Abyss’ encouraged the town of Hranice to open a new information center in the former Teplice nad Bečvou station, a 1939 Functionalist building, cultural monument and important example of railway architecture from the first half of the 20th century.

The information center features an interactive 3D model of the Hranice Abyss, capturing the latest knowledge and research on the abyss.

“The abyss is an incredible natural rarity. We wanted to show visitors, using a large 3D model, what is beneath the surface and on the rising slope,” described architect Jitka Mácová.

3D glasses are available to help show various parts of the abyss, especially the places visitors cannot access. The 3D model was created based on videos recorded by the divers between 2000 and 2017, and then assembled with software. There is also a cinema where visitors can view a short film about the abyss.

The cave diving organization ZO 7-02 Hranice Karst, in cooperation with SG Geotechnika a.s., documented the Hranice Abyss through digital aerial photogrammetry using an unmanned aircraft (UAV). They acquired data which aided in the creation of the 3D digital georeferenced model of the abyss’ dry part. As a result, the model has accurate dimensions, inclinations, and articulations of the rock massif.

Check out the below Hranice Abyss video by Petr Chmel, Pragoaquanaut:

The Hranice Abyss is truly perilous due to its unique water composition. The ČSS ZO-7-02 Hranice Karst divers recently had to use closed-circuit diving equipment, CCR Liberty by Divesoft, to avoid chemical reactions and impaired visibility. With this equipment, the divers could safely dive 50 meters below.

Just how deep is the Hranice Abyss? The abyss was created atypically by mineral water springs far beneath the surface and therefore, it is not certain where the bottom is, though some theories suggest it could be as far down as 1200 meters. In 2015, divers reached 265 meters.

On the other hand, a recent analysis of the water indicated that there are helium isotopes that rise up from 40 km below. “How the helium gets into the abyss and how deep the water are big unknowns,” the President of the cave diving organization, ZO 7-02 Hranice Karst, Michal Guba, explained.

Some of nature’s secrets are yet to be discovered…

The vistor centre opening hours are Tuesday to Friday from 10 am to 4 pm, and on weekends from 9 am to 5 pm.

Address: U Teplic 552, 753 01 Hranice | phone: +420 778 888 643 | e-mail: | website:


Mares & SSI launch new promotion



SSI expands financial support to SSI Members worldwide. 

2020 has been an unusual and challenging year for the entire world, especially the diving and travel industry!  To weather the crisis, SSI immediately jumped into action to help Training Centers and Professionals around the world.  

In response to COVID-19, SSI launched the No Water, No Problem Campaign, put Final Exams online, and held hundreds of Webinars to train Professionals on how to use distance learning to teach the dry Specialties online. The FREE SCIENCE OF DIVING promotion resulted in SSI Training Centers worldwide register over 50,000 FREE DIGITAL KITS, funding more than $3.5 MILLION IN RETAIL VALUE. Additionally, SSI introduced an aggressive DOUBLE PRO REWARDS incentive to help SSI Professionals compensate 2020 Renewal Fees and reduce those for 2021. Currently, the WE WANT YOU Crossover promotion aims to fill the industry need for instructors and strengthen the entire SSI Professional community.

Now, in conjunction with Mares, SSI is launching the GO DIVING – PROTECT YOURSELF. OWN EQUIPMENT Promotion, which includes a FREE SSI EQUIPMENT TECHNIQUES DIGITAL KIT. This new campaign strives to motivate divers worldwide to go diving and buy equipment. Look for more information on this next retail support campaign within the next few days.

“These are just a few examples of how we have supported and are continuing to support our Training Centers, Professionals, and divers worldwide. To provide even more economic security and help in business recovery, WE WILL NOT INCREASE PRICES FOR 2021. While travel was restricted and some key resort areas completely locked down, SSI mainly focused on supporting domestic markets with retail-driven incentives. Now, in this next re-opening phase, we need to shift gear and assist resort markets that have no local diving community and are 100% dependent on the traveling diver. Therefore, SSI will grant certain special conditions and delayed payment options to specific resort markets which have been locked down for longer than six months or suffered from closed borders,” stated Guido Waetzig, SSI CEO.

Guido Waetzig, SSI CEO, explains further, “To financially support these needed investments which directly benefit SSI Members and to protect the health of our valuable members and staff, we will forego all 2021 Trade Shows over the next 12 months. Despite international uncertainty, every time we experience one of these events, the entire SSI Network emerges stronger and more resilient. Be assured, SSI is your trustful partner within the Diving Industry!”

For more information about SSI visit their website by clicking here.

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Photo Gallery: Shark Diving in The Bahamas



In our Gallery feature, we let the photos tell the story… Each Gallery showcases a selection of outstanding images on a chosen theme, taken by our Underwater Photography Editor Nick and Deputy Editor Caroline of Frogfish Photography. This time they look at Shark Diving in The Bahamas.

The Bahamas offers some of the very finest shark diving experiences in the world. The islands have protected sharks in their waters creating one of the first Shark Sanctuaries in the world. Several species of shark can be seen and photographed, with each island offering a different type of shark diving, making this destination the perfect place for a multi-island, multi-shark trip of a lifetime.

Great Hammerhead Shark diving in Bimini

Bull Sharks in Bimini

Tiger Shark off Grand Bahama

Oceanic Whitetip Shark off Cat Island

Nurse Shark off Abaco

Caribbean Reef Sharks off New Providence

Lemon Sharks off Grand Bahama

For more images from The Bahamas and around the world, visit the Frogfish Photography website by clicking here.

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