Starting from the reality of our times, namely that the maritime and river transports are the cheapest, but also the most long-lasting ones regarding the current types of transport, this paper aims at new perspectives regarding the future of the use of both civil and military ships. Along with other objects and processes, ships must learn to adapt to a rapid changing world. The following issues will be considered: (1) Creating a picture of the future, as plausible as possible, taking into consideration even the pandemic times. (2) The way in which shipping will be positioned in the future. The role shipbuilding may play on the scale of the large global players, taking into account the demographic and economic charts (population growth and life expectancy, involvement in the workplace etc.). (3) What will happen to the old military ships in the event of demilitarization? (4) What would the floating homes and communities of the future look like? In conclusion, reconversion of old (military) ships in civilian transportation and/or mobile dwellings would be a good approach from the point of view of economics and human resources.

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Starting from the mathematical modelling of the gas dynamics processes and, of course, from the needs of the Diving Center, several schemes of experimental installations were developed. These schemes are used for the preparation of binary or ternary gas mixtures, specific: for autonomous professional diving, for the system diving, respectively for those simulated or real which are performed in the hyperbaric chambers of the Diving Center or in the diving turrets. The principle of preparing breathing gas mixtures in the experimental installation ensures that an invariable flow rate (with the pressure of the gaseous mixture from a pressurized cylinder) is injected (constant mass flow) while ensuring the permanent control of this flow. The installation delivers an invariable gas mixture flow regardless of the gas pressure value inside the storage cylinder. Depending on the number of components from which the binary or ternary breathable mixture is to be prepared, the design of the plant has been structured in two parts or in the case of a more complex ternary structure of the gaseous mixture, the plant has three distribution-injection lines active. Each of these lines independently carries the three pure component gases used to continuously produce the required respiratory mixture. Finally, the tests of the gas-dynamical processes related to the plant were presented very succinctly, following a comprehensive testing and evaluation plan in the summer of last year.