The invention relates to a high reliability vessel where redundancy zones are provided. It is an objective of the present invention to provide an improved system for a high reliability vessel that overcomes complexities in prior art and provides improved reliability. The present invention attains the above-described objective by providing a vessel comprising a plurality of redundancy zones, a thruster system comprising at least two thrusters to create transversal thrust, and a main power supply system comprising a generator system, and a main electrical distribution system comprising a switchboard system, characterized in the vessel further comprises an energy storage system comprising a plurality of energy storage subsystems, wherein at least one of the thrusters with an operatively connected energy storage subsystem is located in a first redundancy zone, and another of the thrusters and the generator system is located outside said first redundancy zone.