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Submarine tower escape decompression sickness risk estimation.

G A M Loveman, E M Seddon, J C Thacker

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    Summary
    This summary is machine-generated.

    A new model estimates decompression sickness (DCS) risk for distressed submarine (DISSUB) escape. Risks are low for shallow escapes but significantly increase with depth and saturation, exceeding 60% at 200 meters from saturation.

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    Area of Science:

    • Hyperbaric Medicine
    • Submarine Escape Physiology
    • Risk Assessment Modeling

    Background:

    • Distressed submarine (DISSUB) survival actions require understanding decompression sickness (DCS) risks during tower escape.
    • Accurate DCS risk estimation is crucial for crew safety protocols in submarine emergencies.

    Purpose of the Study:

    • To calibrate and apply a mathematical model for estimating DCS risk in submarine escape scenarios.
    • To predict DCS likelihood for UK Royal Navy tower escape systems under various DISSUB conditions.

    Main Methods:

    • A mathematical model for DCS risk was calibrated using data from 3,738 exposures (men and goats) to raised pressure.
    • Body mass was utilized to scale DCS risk.
    • Data included over 1,000 submarine escape exposures; pulmonary barotrauma cases were excluded.

    Main Results:

    • Escape from DISSUB depths < 200 meters with internal pressure at -0.1 MPa is estimated to have a DCS risk < 6%.
    • Saturation at raised DISSUB pressure significantly increases risk; a 200-meter escape from 0.21 MPa saturation predicts > 60% DCS risk.
    • The model's predictions for direct ascent from saturation align with other published models.

    Conclusions:

    • The calibrated model provides valuable quantitative risk assessment for DCS during submarine escape.
    • Escape depth and saturation pressure are critical determinants of DCS risk in DISSUB scenarios.
    • The model supports informed decision-making for DISSUB escape procedures and safety.