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Marines Take a Plunge in Helo Dunker

By Cpl. Ryan D. Libbert

CAMP HANSEN, Okinawa, Japan — The water rushes into every orifice of your body making it hard to think, making it hard to breathe. Your body is thrown around from the violent impact as you are placed into a small chamber with rising water quickly consuming it. The panic that sets in normally leads service members to drown during a helicopter crash into the ocean, but with proper training Marines are starting to gather confidence in surviving such a horrific event.

The Helo Dunker located at Camp Hansen is the main tool in teaching Marines how to survive a helicopter crash over water. By placing Marines in a chamber resembling the troop area of a CH-46 Sea Knight or CH-53 Super Stallion helicopter, the device develops survival techniques for Marines according to Armando Alonso, site manager for Survival Systems USA’s Okinawa office.
"Our purpose is to instruct Marines on how to properly egress a ditched helicopter anywhere in the ocean," Alonso said. "The Marine Corps has been using the helo dunker on Okinawa since August of 2002."

The helo dunker, also referred to as the Modular Amphibious Egress Trainer or MAET, has been a part of educating Marines in water survival for several years.

The helo dunker has become more prominent in training Marines recently Seven Marines lost their lives via drowning in the Pacific Ocean after a deadly helicopter crash off the coast of Miramar, Calif. in December 1999. The following investigation proved the helo dunker should be used more often to properly train Marines when a similar event occurs again.

Since its development, the Marine Corps has installed a helo dunker at Camp Pendleton, Camp Lejeune and Hawaii with the newest on Okinawa.

"Since the installation of the helo dunker on Hansen we have trained almost 2,000 Marines on how to properly egress a helicopter," Alonso said. "We cannot determine exactly how many lives the MAET has saved, but we have received testimonials from individuals who have survived a crash by applying what they have learned here."

The helo dunker is lowered into the water at 2.5 meters per second via a mechanical system. It also has the capability to spin around while being lowered giving more realism to the training while disorienting the Marines in it.

"Before I went through this training I never thought about a helicopter crashing when I’m riding in it," said Lance Cpl. Robert A. Vasquez, antitank assault guided missileman from Company G, 2nd Battalion, 3rd Marine Regiment. "I think this is the most realistic training Marines can get without actually crashing."

After training nearly 2,000 Marines on advanced water survival, Alonso reflects on the success of the helo dunker and is proud to have educated Marines on how to properly egress from a helicopter.

"The most common fear Marines have before going through the process is being in an enclosed space with a seat belt on as water rushes in over your head," Alonso concluded. "When it is all done and over with I think each Marine has a higher level of confidence in surviving a ditched helicopter."


The helo dunker at the Camp Hansen pool swings in the breeze as Marines from Company G, 2nd Battalion, 3rd Marine Regiment and an instructor from Survival Systems USA prepare to be ditched into the water. Nearly 2000 Marines have trained in the dunker since its debut in August 2002.

Photo by: Cpl. Ryan D. Libbert

Lance Cpl. Robert A. Vasquez, antitank assault guided missleman from Company G, 2nd Battalion, 3rd Marine Regiment, assumes his crash position inside the helo dunker moments before being submerged. The helo dunker is designed to give Marines a realistic experience of crash landing in a ditched helicopter over water.

Photo by: Cpl. Ryan D. Libbert

U.S. Army
Aircrew Ditching Course

Submitted By:
CPT Gifford Jones, U.S. Army
Chad J. Copeland, Survival Systems USA


One of the Army’s most progressive training schools opened for Army Aviation in January. The United States Army has recently introduced The Aircrew Ditching Course (ADC) at Ft.Rucker, Alabama. This is one of the Army’s finest acknowledgements of the emerging joint operations involving overwater flight. The course is comprised of 16 hours of intense training on how to prepare for an over water ditching, appropriate egress procedures, and surface survival techniques while awaiting rescue. The course also incorporates the Aqua Lung SEA MK2 Emergency Breathing System (EBS) to allow aircrew to breathe underwater and execute necessary steps to survive an aircraft ditching. The course is punctuated by one of the most advanced underwater escape trainers in the world. The Modular Escape Training System (METS™) designed by Survival Systems USA Inc. (SSUSA) accurately replicates the AH-64, UH-60, CH-47, and OH-58 helicopters. The trainer allows aircrew to enter their familiar aircraft environment, ditch and invert in a 90,000 gallon training tank, and escape from the trainer while closely supervised by the Survival Systems staff. The 2-day training course is comprised of 8 hours of academic instruction and 8 hours of practical application.

On the first day of training the students are given a tour of the facility followed by 4 hours of academic instruction. The academics are comprised from 22 years of experience, research, and development on how to survive an overwater ditching. Everything from the history of aircraft ditching to the appropriate brace position to minimize bodily injury, steps to safely egress the aircraft, and how to safely employ the EBS are thoroughly covered by the Survival Systems USA instructional staff. The EBS instruction is a course on the dangers of breathing compressed air, compressed air physics, and how the SEA MK2 works and is properly maintained. The afternoon session builds on the lessons taught in the class through practical application. The students are introduced to the Shallow Water Egress Trainer (SWET), where they practice egress procedures while turned upside down in a shallow and controlled training environment. The first lessons are all on breath hold to allow the student to concentrate on egress procedures and build confidence in their ability to perform. Once the student is comfortable with egress procedures, they are placed in the METS™ in their appropriate crew station next to their appropriate aircraft exit (UH-60, OH-58 etc.). All of the exits on the METS™ are custom built to accurately represent an actual aircraft exit. The flight controls, stroking seats, and armor plating all simulate actual movements in a crash sequence. The entire METS™ is built as close to aircraft specifications as possible to ensure the aircrew gets an accurate feel for their own helicopter during egress. The students go through multiple evolutions that gradually become more difficult. Starting with doors off and concluding with traveling to a secondary exit, jettisoning the exit while upside down and egressing safely. After successful breath hold exercises, EBS is introduced to the aircrew and applied to the egress skills they have already learned. The aircrews learn how to clear and breath upside down, practice in the SWET, then return to the METS™ to include using the EBS during egress sequences and further increase their confidence in egressing underwater.

The progressive training of day 1 is reinforced in day 2. 4 more hours of advanced academics on surface survival, life raft use, cabin evacuation, and review of the previous days initiate the start of day 2 training. The student will continue to deal with complex underwater egress scenarios until they master the skills by demonstrating the ability to egress an aircraft upside down, under water, in the dark, with an EBS, through a secondary exit. The confidence a pilot expresses after completing this final evolution is significant. The class continues the practical exercises doing group drills. The class is loaded into the METS™ and taught how to organize a surface evacuation; this exercise is complicated by the addition of smoke generators to restrict visibility. The students evacuate the aircraft, activate CO2 cartridges in their life preservers, and organize the group to inflate and enter a real life raft. The aircrew is also shown group formations to lock into, if a life raft is not available. During these group formations the aircrew is shown how to care for an injured person, move as a group, and stay together in rough seas. By the end of the second day the class is physically exhausted and extremely proud of the survival education they now posses.

This facility is the first fully equipped and Survival Systems USA staffed over water training device for the U.S. Army. The student feedback has been positive to say the least. This program supports the new AR 95-3 expected to be approved soon and gives the Army a standard of excellence that is not matched by any other Department of Defense service. This course is the Army’s first Aircrew Ditching Course to be fully integrated into the Army Systematic Approach to Training (ASAT) to insure future over water training sites follow the same high standard of training.

This training center represents the dedication of the U.S. Army’s leaders to its aircrews and recognizes the value of every War Fighter.


For more information, please contact us at:

Survival Systems USA, Inc.
144 Tower Avenue,
Groton, CT 06340

Phone: 860-405-0002
Toll-free: 888-386-5371 Fax: 860-405-0006