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The main conclusions of the review in order of importance are: (1) Analysis of submarine peacetime operations indicate that for 64% of the time they operate in water depths of less than 180 metres, 1% of the time in water depths of between 180 and 700 metres, and 35% beyond 700 metres. Therefore future activity to improve the overall survival chance of escapees and personnel rescued by submersible should be concentrated in water depths of less than 180 metres. A major corollary is that future submarines need not be specially designed to provide escape bulkheads for depths greater than 180 metres. (2) Escape and rescue are not necessarily alternative options even in depths of water less than 180 metres; both escape and rescue may be required depending on the circumstances. Either may be the only method of survival and it is therefore imperative that both systems should be retained. (3) The present alerting and locating systems in British submarines are unacceptable. (4) Men in all main watertight compartments fitted with escape towers do not have sufficiently accurate monitoring equipment or instructions to enable them to make decisions for survival both inside the DISSUB, and/or when to escape safely or whether to await rescue. and (5) Submarine design need not be constrained to facilitate compartment escape for large numbers.