 If a rescue vehicle is not available or cannot connect to a sunken submarine, the crew can escape using the SEIE.Another benefit of vehicle rescue as compared to escape with the SEIE is that there would likely be additional critical on-site resources available, such as a recompression chamber, that could be urgently needed by the rescued crew members.Reduced risk of decompression sickness, oxygen toxicity, carbon dioxide toxicity and nitrogen narcosis is dependent on a relatively high rate of pressurization and ejection from the escape lock, as all of these hazards are time-dependent.