News
BSAC releases gas density tables – sign up to FREE webinar this Sunday
BSAC has released three sets of gas density tables for its members.
Considered an important source of safety information based on empirical research, the tables are intended to inform planning for safer deeper diving (>40m). In recent years there has been an increased understanding of the importance of gas density in gases breathed under pressure. BSAC has now released tables that recommend breathing mixes for open and closed-circuit divers.
The tables were specifically developed for mixed gas divers but gas density values also have implications for informing safe depth parameters for air and nitrox divers. The new tables align with findings from research conducted by Gavin Anthony and Professor Simon Mitchell that were presented in 2015 in a paper entitled Respiratory physiology of rebreather diving. Gavin is a BSAC member and Advanced Instructor, as well as the principal scientific advisor for BSAC National Diving Committee (NDC) Technical Group. He has been involved in the development of these tables from inception through to publication. The tables were then formulated by BSAC Technical Instructors Trevor Davies and Mike Rowley.
Mike Rowley said: “I’m thrilled to be able to release this really important safety support for our members. Gavin and Simon made the research freely available online but the point of developing look-up tables was so divers can see at a glance what the optimum gas mixture is for any given depth and application.”
BSAC members can access and download the gas density tables online.
So, what is gas density and why is it important for divers?
Gas density is a measure of mass per unit volume, measured in grams per litre (g/l). The deeper you go the density of the air you breathe increases. A high gas density means a given volume of gas weighs more and takes more effort to move, resulting in increased work of breathing (WOB).
Gas density is why WOB increases as we go deeper, and increased WOB, in turn, predisposes divers to CO2 retention. It is increasingly accepted that elevated breathing gas densities are dangerous and may well be implicated in exacerbating a range of diving ailments including not only CO2 retention but also O2 toxicity, nitrogen narcosis, decompression illness and immersion pulmonary oedema. Furthermore, elevated gas densities can impair the performance of breathing equipment such as regulators and rebreathers.
Mike Rowley said, “The role of gas density and its relevance has not been universally addressed in diving education. However, BSAC is now assisting divers in factoring this into diving planning with these new tables. The tables allow the diver to readily see optimum gas mixtures based upon gas density therefore they are a proactive planning tool.”
In relation to BSAC diver training and safety recommendations:
- This update has already been included in BSAC’s Safe Diving guidance.
- Gas density is to become the basis for gas planning in all of the BSAC mixed gas courses.
- Gas density also has implications to inform Dive Leader, Advanced Diver and First Class Diver safe diving parameters.
The National Diving Committee (NDC) will be working on and considering the above in its ongoing developments.
What are the tables exactly?
The BSAC gas density tables show in tabular form:
- Breathing gas densities for a variety of gas mixtures including air, nitrox, trimix and heliox at depths of 5m increments from 35 metres to 130 metres.
- Equivalent narcotic depths (END) for each gas mixture and depth increment.
There are three tables in total. Two tables are for open circuit gas mixtures. One is based upon a partial pressure of oxygen (PO2) of 1.4 bar. This table is for use by open-circuit divers choosing safe dive gas. The other open-circuit table is based on a PO2 of 1.6 bar and is intended for use by open-circuit divers choosing accelerated decompression gases and rebreather divers choosing open-circuit bailout gases.
Each table shows a range of breathing gas mixtures for each depth increment that come within the safe gas density parameters for that depth. Each table also has a much smaller table of “ideal” gas mixtures for the depth increments.
Further information and support
A webinar entitled The lowdown on gas density tables is scheduled for Sunday 21 June from 19:30-20:30. To be held by BSAC’s highly-experienced technical instructor, Mike Rowley, this webinar will help you understand more and give you the opportunity to have your questions answered.
Find out more and sign up online.
Please contact BSAC’s Diver Resources Team with any questions, comments or feedback. They are available at drt@bsac.com or on 0151 350 6203.
Ho Ho Ho! Vobster Quay’s recording-breaking charity Santa diving event returns on Sunday 15th December 2024 for another round of festive fundraising frivolities. Run in aid of the Royal National Lifeboat Institution (RNLI) and Help For Heroes, this ever-popular annual fundraising event aims to raise sack-loads of cash for these two very deserving charities.
Divers of all levels are invited to grab their Santa outfits – and as much festive cheer as they can muster – and head down to Vobster Quay near Mells, Somerset for a mass sponsored Santa dive in aid of charity. In previous years, the event has attracted divers from the far corners of the UK to join in the festive merriment for a final festive dive before the Christmas and New Year break. Back in 2015, the event smashed the world record for the most Santa divers with 188 divers taking to the waters donning their festive finery – a record that remains unbeaten to this day!
Vobster Santas isn’t just about setting records – it’s also about raising some serious cash for charity. Vobster Quay encourages all divers to get into the spirit of the season to raise much-needed funds for two very deserving charities – the Royal National Lifeboat Institution (RNLI) and Help For Heroes.
Through individual sponsorship and online donations, divers can invite their friends, family and work colleagues to sponsor them to plunge into the balmy waters of Vobster Quay dressed in full festive finery. Since the very first Santa dive in 2007, the event has raised over £52,000 for charity. “It’s been over 17 years since the very first charity Santa dive took place at Vobster Quay and every year the event just keeps getting bigger and better” enthused Vobster Quay owner, Amy Stanton.
“Vobster Santas is a great way for divers to say a massive thank you to the both the RNLI and Help For Heroes – two very deserving charities close to our hearts. We’re immensely proud of all that Vobster Santas has achieved and hope that even more divers will join this year’s event on Sunday 15th December. I’m confident that we can make Vobster Santas 2024 the biggest yet!”.
Divers wishing to participate can get involved by simply registering their attendance at
www.vobster.com/event-vobstersantas.php.
Blogs
Dive into Adventure at Hideaway Beach Resort & Spa: The Ultimate Diving Destination in the Maldives
Tucked away in the remote northern Haa Alifu Atoll, Hideaway Beach Resort & Spa is a premier destination for anyone seeking an unforgettable underwater experience. With over 30 dive sites to explore, divers of all levels can witness the unique and mesmerising beauty of the underwater world. Whether you’re a seasoned diver or new to the sport, Hideaway offers an exceptional diving adventure that is not to be missed.
Explore the Beauty Beneath the Surface
Hideaway is perfectly situated near some of the most spectacular dive sites in the Maldives. The dive school and team at Hideaway offer a very personalised experience to ensure each diver gets an interactive, immersive experience.
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Unique dive spots such as Theefaridhoo Thila (Heaven and Hell) as one of the 50 best dive sites in the whole of the Maldives, known for its beautiful soft coral gardens.
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As the resort is located next to a channel which gives guests surprise visits from eagle rays, manta rays, guitar sharks and more.
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One of the standout features of diving in the Haa Alifu Atoll is the abundance of rare and exotic marine species. The area is known for sightings of whale sharks, manta rays, turtles, and a variety of colorful reef fish. Diving at Hideaway Beach Resort & Spa offers a rare opportunity to encounter these creatures in their natural habitat, creating lifelong memories for guests.
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Whether you’re exploring deep coral gardens, dramatic overhangs, or vibrant reef walls, each dive offers something new and exciting. The visibility in the Maldives is exceptional, often exceeding 30 meters, making it ideal for both underwater photography and general exploration.
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Diving for All Levels
At Hideaway, we believe that everyone should have the opportunity to experience the thrill of diving. That’s why we cater to divers of all levels, from beginners to experienced professionals. Our professional dive center, led by expert instructors, offers a range of courses and guided dives. If you’re new to diving, you can start with an introductory course that will teach you the basics of scuba diving in a safe and controlled environment.
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For more experienced divers, we offer advanced dive courses and guided excursions to some of the more challenging dive sites. Our instructors are knowledgeable and passionate about the local marine life, ensuring that every dive is not only safe but also informative and enjoyable.
Email: reservations@hideawaybeachmaldives.com / Call: +960 650-1515 / Website: www.hideawaybeachmaldives.com
Exclusive Diving Offer
To make your stay even more unforgettable, Hideaway is offering an exclusive diving package designed to enhance your experience both above and below the water. When you book a minimum 7-night stay, you’ll receive:
- 35% discount on room rates.
- Complimentary diving: 3 dives per person for 2 guests, allowing you to experience the beauty of the Maldives underwater world.
- Free meal plan upgrade: enjoy a complimentary upgrade from Bed & Breakfast to Half Board, or from Half Board to Full Board. Guests who prefer the White Platinum Plan (WPP) can avail it at a discounted rate.
This incredible offer provides the perfect opportunity to experience world-class diving while enjoying all the luxury and comfort that Hideaway Beach Resort & Spa is known for.
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Combinable Offers for Even More Value
This diving offer can also be combined with our Anniversary and Honeymoon offers, allowing you to create the perfect celebration package. Whether you’re celebrating a milestone or simply seeking a romantic getaway, this offer ensures that you can enjoy the best of both worlds – luxurious accommodations and unforgettable diving adventures.
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Terms & Conditions
- This offer is available exclusively for bookings made through the official Hideaway Beach Resort & Spa website using a specific booking code.
- The offer cannot be combined with other promotions available on the website or through other channels, nor can it be redeemed for cash.
- All dives are subject to weather conditions, ensuring the safety and enjoyment of all guests.
- Black-out dates: This offer is not available from 24th December 2024 to 9th January 2025.
To book this exquisite offer, use the Promo Code: SCUBA24FD
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Hideaway is not just a resort; it’s a sanctuary for those seeking peace, adventure, and luxury. With spacious villas, private pools, and world-class dining options, the resort offers everything you need for a perfect holiday. From tennis, golf, gym, cycling to the exquisite underwater activities, unique dining options, Hideaway has something for everyone. And for diving enthusiasts, it provides an unparalleled opportunity to explore some of the most beautiful dive sites in the world.
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Our dive center is fully equipped with state-of-the-art gear, ensuring that every dive is safe, comfortable, and enjoyable. Our instructors are passionate about the underwater world and are eager to share their knowledge with you, whether it’s your first dive or your 100th.
Email: reservations@hideawaybeachmaldives.com / Call: +960 650-1515 / Website: www.hideawaybeachmaldives.com
The Ultimate Dive Adventure Awaits
If you’re looking for an unforgettable diving holiday in the Maldives, look no further than Hideaway Beach Resort & Spa. With over 30 dive sites, unique marine life, and exclusive offers, we provide the ultimate underwater experience. Whether you’re celebrating a special occasion or simply seeking adventure, our diving package offers exceptional value and incredible memories.
Book now through our official website to take advantage of this exclusive offer and prepare for the dive adventure of a lifetime.
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Call: +960 650-1515
Website: www.hideawaybeachmaldives.com
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