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This document outlines the challenges and proposed solutions for human trials on the Indigenous Submarine Escape Suit (SES) designed for operations up to 100 meters of sea water. It covers issues such as diving complications, medical risks like hypoxia and decompression sickness, as well as the psychological aspects that may affect divers. The trials aim to enhance safety measures for submarine escapes, ensuring that appropriate breathing gas mixtures and controlled ascent rates are effectively monitored. The outcomes may lead to significant advancements in naval medicine and operational safety.
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100 MSW Trials on Indigenous SES: Problems & Solutions Surg Lt Cdr Rohit Verma PMO & Graded Specialist (Marine Medicine) INS Nireekshak
SCOPE • Background • Overview of the Problems of the Trial Directive • Proposed Objective of the Trials • Limitations of the Trial • Diving Issues & solutions • Medical Aspects & solutions • Conclusion
Background • Submarine Escape Suit (SES) • “Wet escape”: Exposure to the ambient pressure • Provide “breathable” pressurised gas mixture • Hypoxia • Oxygen Toxicity • Choice of “diluent gas” • Minimise chance of DCS & Inert Gas Narcosis • Controlled Ascent Rate • Reduce risk of barotrauma & CAGE • “Survival at Sea” aspects
Background • Currently Used: IDA 59M • Soviet origin • Mechanical model • Provides “Trimix”: 25% O2 + 15%He + 60% N2 • Varying amounts of Oxygen according to depth • ↓ O2: Reduces chances of O2 toxicity at depth • ↑ O2: Reduces chances of DCS at shallow depths & surface • Indigenous SES • Reverse engineered by DRDO • SMHQ: Need felt for “Human Trials” to 100MSW
Problems of the Trial DirectiveOverview • Mimicking Submarine Escape • Control on IDA 59M • Compression & Decompression Rates • Submarine Escape Tables • Objective monitoring of Parameters
Proposed Objectives of the Trial • Partial Pressure of Oxygen • Partial Pressure of Nitrogen • Partial Pressure of Carbon Dioxide • Psychological Aspects • Endurance of the set
Limitations of the Trial • No remark on the individual set • Thermal insulation offered by the set • Pressure endurance of the materials of the set • Survival at Sea aspects
Diving Issues and Solutions • Classification as Experimental Dive • Rate of Compression • Decompression Schedule • Endurance of the Set
Medical issues and Solutions • Illnesses due to breathing gas abnormalities • Hypoxia • Hyperoxia • Carbon Dioxide Toxicity • Illnesses due to Inert Gas • Inert Gas Narcosis • High Pressure Neurological Syndrome
Medical Issues and Solutions Decompression Sickness • Preventive Strategies • Slow rate of Decompression • High Vann K factor • High Partial Pressure of Oxygen • Selection of Personnel
Medical Issues and Solutions Decompression Sickness • Therapeutic strategies • Type I DCS post dive • Type II DCS post dive • DCS during the course of the dive Barotraumas Not Dive Related (NDR) Illnesses Psychological issues
Conclusion • Most complex human trial attempted in the Navy • Multiple spin offs