1 Oct 2010

Qual a Maior Causa de Acidentes de Mergulho? 45% das vítimas não mergulhava à mais de 12 meses...

from the February, 2009 issue of Undercurrent

When asked to identify the main causes of diving accidents or near misses, U.S. Navy divers identified nontechnical rather than mechanical or environmental causes. Complacency, followed by fatigue and inexperience, was the most common reply.
In a review of 1,000 recreational diving mishaps, inexperience and insufficient training accounted for 14 percent and 8 percent respectively of the contributing factors to the mishap. Also, in a review of 109 recreational diving fatalities that occurred in 2003, nearly 45 percent of victims had not dived in the 12 months prior to their mishaps.
Dr. P.E. O’Connor, The nontechnical causes of diving accidents, Society of the Undersea and Hyperbaric Medical Society, Vol. 34, No


O treino é essencial para manter a sua técnica presente, o seu mergulho seguro, tornando como segunda natureza todos os procedimentos. 
Caso contrário, estará a pedir para que uma situação de simples solução resulte num acidente.

Treine frequentemente.

STI (Individual Trainning Session) from ADNG DIVERS on Vimeo.

Já não mergulha à bastante tempo?
Não será por sí só, ou com um amigo(a) mergulhador que irá recuperar os procedimentos esquecidos.
Faça uma Reciclagem de Mergulho,

com um profissional credenciado, 
que mergulhe frequentemente nos mais variados tipos de cenários.
Só essa experiêncipoderá ser para si uma fonte válida de conhecimento.

Para teoria, tem os seus manuais..
Para informações adicionais utilize o seguinte formulário aqui 

Project Aware: Photostream - Cleanup Activities

30 Sep 2010

Best Environmental Photos of 2010 Named

Overall Winner: "Flight of the Rays"

Photograph by Florian Schulz, WICEM/Barcroft/Fame Pictures 

Thousands of Munk's devil rays crowd the Sea of Cortez off Mexico's Baja California Sur state (map) in 2009. The aerial image won top honors and the "Underwater World" category in the 2010 Environmental Photographer of the Year awards.

German photographer Florian Schulz said the scope of the ray congregations was unknown until he and a pilot happened upon the gathering while searching for migrating whales.

Perhaps just as rare is the composition Schulz captured. "I was able to show how these rays are jumping out of the water," he said, "and at the same time I'm able to show—almost like an underwater photograph—how there're layers and layers and layers of rays."

The International Union for Conservation Union lists Munk's devil rays as near threatened, due in part to their vulnerability to gill nets—hard-to-see "curtains" of netting.

Given ray gatherings like the one pictured, Schulz said, "you could imagine a single net could take thousands and thousands."

This helps explain why, upon seeing the winning photo, marine ecologist Giuseppe Notarbartolo di Sciara emailed Schulz to express his delight at seeing so many Munk's devil rays thriving in a single frame. Di Sciara helped identify the species in 1987.

Organized by the London-based Chartered Institution of Water and Environmental Management, the Environmental Photographer of the Year contest honors amateur and professional photographers who "raise awareness of environmental and social issues." This year's edition drew more than 4,500 entries from photographers in 97 countries.

—John Roach

Published September 29, 2010


Semana da Imagem Subaquática de Portimão 2010

No seguimento do sucesso obtido nas edições anteriores, o PORTISUB e a APDM voltam a organizar uma nova edição da Semana da Imagem Subaquática de Portimão.

Contando com os indespensáveis apoios da Câmara Municipal de Portimão, do Museu de Portimão e da Algarve Film Comission, e com o patrocínio do Hotel Jupiter, esta iniciativa, traz a Portimão, uma vez mais, um conjunto de eventos ligados à fotografia e vídeo subaquático.

AGENDA
Sexta, 8 de Outubro
19h00 - Inauguração da exposição de fotografia com as melhores fotos do FOTODIGISUB 2009 - Troféu Nacional de Fotografia Subaquática, que estará exposta até 17 de Outubro

Sábado, 9 de Outubro
15h00 - VideoDigiSub 2010 - Festival de Vídeo Subaquático de Portimão           

Domingo, 10 de Outubro - Museu de Portimão
21h00 - Exibição do multi-premiado documentário End of the Line, sobre a necessidade de preservar os recursos pesqueiros

Quarta, 13 de Outubro - Museu de Portimão
21h00 - Exibição do filme The Cove, sobre a captura de golfinhos no Japão, premiado com o Oscar de melhor documentário

Sábado, 16 de Outubro
09h00 - FotoDigiSub 2010 - Troféu nacional de fotografia subaquática - Etapa Final

Domingo, 17 de Outubro
13h00 - Almoço de encerramento do evento e entrega de prémios do CascoAntiguo FOTODIGISUB 2010

Lesmas-do-mar mais eficientes na fotossíntese do que algas


Investigadores portugueses descobrem que lesmas-do-mar fotossintéticas podem ser mais eficientes na fotossíntese do que as próprias algas que consomem. Já há muito tempo se conhece uma destas espécies com uma capacidade invulgar: guardar alguma da maquinaria das células das algas que consomem (os cloroplastos – as estruturas mais importantes para a fotossíntese) e mantê-los funcionais dentro das suas próprias células, produzindo assim parte do seu próprio alimento através da fotossíntese, tal como uma qualquer planta.

Notícia completa aqui.

29 Sep 2010

Perfis de Mergulho Invertidos: Agora Aceites. Mergulho Mais Profundo Primeiro? Ou Desnecessário?

 Praticamente todos os mergulhadores aprenderam a fazer os perfis de mergulho de forma a que o primeiro mergulho do dia seja o mais profundo, seguindo-se dos restantes menos profundos.

Como poderá ver em baixo foram vários artigos apresentados no sentido de que, a regra já não se aplicará uma vez que os computadores de mergulho modernos são capazes de recalcular os seus mergulhos independentemente do perfil seleccionado, e, mantendo-se dentro dos limites não descompressivos (NDL).

Os estudos foram comprovados pelas entidades:
  • American Academy of Underwater Sciences, 
  • DAN,
  • DEMA
  • Dive Training magazine.

Independentemente se acha que deverá manter o conservadorismo da Regra "Antiga", esteja informado(a) sobre os estudos mais recentes.



 
Deepest Dive First? Not Anymore
October 18, 2006

Announcing a major breakthrough in recreational diving thanks to dive computers and underwater scientists.

One of sport diving's most sacred rules has been challenged and found lacking: the prohibition against reverse dive profiles (following a shallow dive with a deeper one) that resulted in a phrase memorized by millions of divers: "Always do your deepest dive first."

Well, it turns out, if you're using a dive computer for multilevel diving, you can do your dives in any order you wish. Of course, use your dive computer intelligently and stay within the no-decompression limits. Yes, this reverse profile is fine—50 feet for 45 minutes followed one hour later by a dive to 90 feet for 20 minutes. The U.S. Navy tables would require an 18-minute decompression stop at 10 feet, and the PADI RDP does not allow for the second dive, as it is off the tables. All modern dive computers allow for these reverse profile dives.That's the conclusion of the "Reverse Dive Profiles Workshop" conducted at the Smithsonian Institution in Washington, D.C. Under the guidance of the Smithsonian's Michael Lang, the American Academy of Underwater Sciences, DAN, DEMA and Dive Training magazine, 49 leaders from a cross section of diving gathered to listen to 29 scholarly papers delivered over a two-day period, followed by eight discussion sessions to hammer out consensus findings.

The conclusions of the workshop are historic. Not only do they provide greater freedom for experienced computer divers to plan and execute multilevel dives; but the broader impact will likely be that the entire dive industry will take a more open-minded look at other rules of diving, skills and procedures, and then ask "Why?"


 in: scubadiving.com





 Controversial Reverse Dive Profiles

The May issue of Undercurrent published the results of a 2005 study conducted by Australian researchers Edmonds, McInness, and Bennet meant to refute the conclusions of the 1999 Reverse Dive Profile Workshop. In that workshop, held at the Smithsonian Institute and sponsored by DAN, DEMA, the American Association of Underwater Sciences (AAUS), and Dive Training magazine, 49 participants concluded that because of the lack of scientific evidence prohibiting reverse dive profiles (RDPs), they found no reason to recommend a prohibition against them. As Undercurrent reported in May, the only caveats were that RDPs should occur within the no decompression limits for recreational diving (130 feet), and depth differentials should be no greater than 40 feet. Although some participants didn’t agree that the prohibitions against RDPs should be abolished completely, all agreed on these restrictions to remain conservative and reach consensus.
in: Blue Planet Divers: Controversial Reverse Dive Profiles


The Sea Hunters: Mystery Submarine - The Search for Swiss Air Flight 111

On a warm summer night in 1998, Swiss Air Flight 111 fell from the sky into the North Atlantic, just off the coast of Nova Scotia, Canada. This tragic event triggered one of the largest and most extensive search and salvage efforts ever undertaken in the world’s oceans. During this incredible search, a long cylindrical object was discovered [The Underwater Channel]