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Transfer under pressure (TUP) diving uses isobaric transfer for decompression. Six air diving decompression tables were compared, with USN and DCD procedures generally showing longer decompression times but potentially lower decompression sickness risk.

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Area of Science:

  • Commercial Diving
  • Decompression Physiology
  • Occupational Safety

Background:

  • Growing interest in transfer under pressure (TUP) decompression for commercial diving.
  • TUP bridges surface-oriented and saturation diving, involving isobaric transfer from a bell to a chamber.
  • This method aims to optimize decompression procedures for divers.

Purpose of the Study:

  • To compare six international decompression tables used in air diving.
  • To evaluate differences in total decompression time (TDT), oxygen breathing time, and gradient factors (GF high/low).
  • To assess surrogate measures for estimating decompression sickness probability (PDCS).

Main Methods:

  • Comparative analysis of six decompression tables: DadCoDat (DCD), Defence and Civil Institute of Environmental Medicine (DCIEM), Comex MT92, and United States Navy (USN).
  • Evaluation of TDT, oxygen breathing time, GF high, and GF low as outcome measures.
  • Assessment of allowances and restrictions for repetitive diving across procedures.

Main Results:

  • USN and DCD tables generally recommended longer TDT and oxygen breathing time with lower GF high compared to MT92 and DCIEM.
  • USN procedures exhibited significantly higher GF low due to shallower first stops.
  • Repetitive diving allowances varied extensively among the six procedures.

Conclusions:

  • Experimental validation is lacking for all tables, preventing definitive conclusions on PDCS differences.
  • All tables are internationally recognized, with selection potentially influenced by factors beyond PDCS.
  • USN and DCD procedures are anticipated to offer lower PDCS than MT92 and DCIEM, though the extent is unknown.