Showing posts with label Navy Medicine. Show all posts
Showing posts with label Navy Medicine. Show all posts

Wednesday, November 4, 2009

** Diving History -- Torpedo Town U.S.A.....Whales.....and Sheats (Part I) **

TORPEDO TOWN, U.S.A.

Navy Diving traces its roots back to the late 1800s as a collateral duty for Gunners Mates. This was mostly to support the recovery and development/testing of a new weapon of naval warfare known as the torpedo. Back then divers were simply instructed in things like how to dress out and hand crank an air pump as the program was in its infancy (any sort of diving science didn't exist). In these very early years of development the Navy's diving community mirrored that of the torpedo in many ways. This article will discuss a bit about both with focus on the Keyport, WA area. If you have ever been involved in diving in any way, shape or form and get the opportunity to visit this area; you will find some of the richest diving history out there - even if you were to exclude the undersea museum.

In the late 1800s the Navy was developing a weapon that would revolutionize warfare called the torpedo (then called a mine). As with any warfare device, it required extensive development and testing. Testing would be conducted at a controlled underwater range and test torpedoes would need to be recovered to see what went right and wrong with them; this signaled the Navy's first need for a diver. The Navy's first torpedo range was established in Newport, Rhode Island in late 1869. Soon there after, the Navy established its first diving school under Chief Gunners Mate Jacob Anderson to recover torpedoes in 1882. At the turn of the century, high demand for the torpedo and difficulty in getting them to the west coast showed need for a west coast torpedo station. In 1908 a special task force of officers was sent to the west coast to scout for a clear water site that had sandy bottoms, little tide and depths between 30 and 60 feet. This task force would search areas such as San Diego, Los Angeles, Tacoma and British Columbia. In 1913 the Navy would settle on a little populated peninsula that had recently been named Keyport, WA. The few Keyport land owners that existed did not want to sell to the Navy - for any price. Once condemnation proceedings were complete; each land owner was given a share of a $60,850 pot of money. The Pacific Coast Torpedo Station (PCTS) would be officially commissioned on November 11, 1914 although the base remained to be built. Building #1 would be completed in 1916 and base construction would quickly move forward from there.

The sixth building to be constructed was the base chapel but would not remain as such for long; it would be converted to the Diving Locker after a few years - no I'm not kidding. This coupled with a chamber room addition is what you see today. In 1919 Keyport would hold its first diving class (8-9 enlisted) under Chief Mickey Nolan. Again, in these early years of diving there were no safety procedures like we have today. It was common practice for divers to complete their job, fully inflate their suit and jet to the surface. This stopped after a few years of "strange unknown sickness" occurring in divers (likely the bends or a gas embolism). Initially there was no chamber in Keyport with the closest one being in British Columbia. Because time was at a premium to treat diving illness, those afflicted would usually be suited up and lowered into the deepest possible area, usually off Seattle (200fsw). The Keyport area would not have a chamber until one was built for them in the 1930s. This chamber was constructed at the Norfolk Navy Yard and is said to contain over 600 rivets - easy to believe for its sheer size (it has been nicknamed "The Whale"). The truly unique thing about this chamber is it is still in use today making it far and away the oldest certified recompression facility in the military and certainly one of the oldest active in the world. Testing and retrieving torpedoes was very different in the 1940s than it is today. Back then, torpedo speed and depth measurements were made by a visual system consisting of barges set at each 1000 yard range. Observers on the barges would time the torpedoes as they passed to access speed. Originally, a rough visual estimate was used to determine the torpedoes depth and eventual recovery location. Later depth was determined with the use of nets placed on the range; the hole the torpedo made as they passed through would show its depth for a given distance. Recovery location was solved by placing smoke pots in the torpedo. When it sank, the smoke pot would send up a stream of bubbles to the surface making location much easier for Navy Divers.

Part II of this article will focus on one of the many outstanding Navy Divers who served many years at the Keyport Dive Locker - TMCM(MDV) Robert (Bob) Sheats. His career is as impressive and varied as any in Navy history. Any write-up that showcases the history of the Keyport Diving program would simply be incomplete without including him. Below is a hyperlink that has a great detailed write-up about the development of what would be nicknamed "Torpedo Town, U.S.A." The first hyperlink is Chapter 6 which showcases its diving program - you will see a few old black and whites that include a short write up about Master Diver Sheats -- call it a sneak preview. The second hyperlink contains all chapters of the article.

http://www.hnsa.org/doc/torpedotown/chap6.htm

http://www.hnsa.org/doc/torpedotown/index.htm

Note: Earlier in this article, the Naval Undersea Museum (located at the Keyport Navy Base) was mentioned. If you are ever in the area, it is not to be missed. It contains diving displays such as the Trieste, the end bell of SEALAB II, diving equipment from its inception to present, torpedo and submarine exhibits to name just a few. Below is a hyperlink to the Undersea Museums website.

http://www.navalunderseamuseum.org/

H/Y

Thursday, October 15, 2009

Bob Barth - Lowell Thomas Award

For those of you that know Bob and his tendency to be humble............ He was invited to New York by the National Explorers Club to be presented tomorrow with the Lowell Thomas Award for and exceptional live of exploration under the oceans of the world. Bob is not going to be attending. He will however still be the recipient of the prestigious award. We have attached a copy of the video they will be showing at the presentation.


HOOYAH BOB!


Friday, August 21, 2009

This Day in Diving History - Treatment Tables 5 and 6 introduced into the U.S. Navy

** This Day in Diving History August 22, 1967 - Treatment Tables 5 and 6 introduced into the U.S. Navy **

The use of oxygen in recompression therapy in the Navy does not go back as far as many believe. In fact, it was not until the 1924 edition of the US Diving Manual that a standard recompression therapy was recommended at all; but these were all air tables. Treatment pressure was based on either the depth of the dive (or a multiple thereof) or the depth of relief, oxygen simply wasn't used back then. It wasn't that no one hadn't thought of using O2 however. The roots of using oxygen as therapy for diving illness can be traced back to Paul Bert's experiments way back in 1870. He first observed that when 100% oxygen on the surface was administered to animals after decompression, some of the signs would resolve. Surprisingly, Bert did not try hyperbaric oxygen, which was first proposed several years later. Initial results were actually disappointing, probably because the therapy was too brief.

In 1939, two US Navy medical officers (Yarbrough and Behnke) first published results of DCS treatment using compressed oxygen, but despite their success, the technique was not initially adopted. Instead for the next 20 years, the US Navy continued to recommend a variety of air tables despite long treatment duration and high failure rates. While these deep air tables provided a higher amount of oxygen, they also caused divers to take up amounts of inert gas in doing so. In the early 1960s, the US Navy instituted another series of investigations into low-pressure oxygen tables. Originally tests used 33 feet as a treatment depth; but due to a high recurrence rate, they were altered to use an initial recompression to 60 feet. This treatment depth not only dramatically improved treatment success, but did so in keeping the risk of oxygen toxicity at an acceptable level - the Navy had found "the sweet spot".

On August 22, 1967, Treatment Tables 5 and 6 were introduced into the U.S. Navy. These treatment tables marked the first time that 100 percent oxygen was used at relatively shallow treatment depths in comparison to the deeper air treatment tables (TT's 1-4). Two additional tables were also introduced (TT-5A and TT-6A) that began with an initial deep short excursion on air followed by treatment profiles identical to tables 5 and 6 (TT-5A was quickly abandoned). Because of the success of low-pressure oxygen treatment of decompression sickness, tables 1-4 are now rarely used. Continued experience with the O2 treatment tables revealed frequent reoccurrences of decompression sickness with the shorter procedures in Tables 5, which now sees limited use for treating diving related illness. TT's 7 and 8 were developed in the 80s to address a longer need for oxygen breathing at 60 feet or deep blow-up respectively; followed by TT-9 in the 90s mostly for non-diving disorders with great success.

Reading: Check out "Diving Medicine" by Alfred A. Bove and Jefferson Davis. This book is commonly referred to as The Bove ('Bo-veigh') and I guarantee that either your friendly neighborhood Master Diver, Diving Medical Officer or Diving Medical Technician has a copy.

H/Y