High pressure device for producing a hydrostatic pressure comprises a shaft extending into the Earth

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The invention relates to an aquarium comprising a water reservoir (2), the is in operation with water contains (3) is filled and investigation objects (4, 19), in particular biological organisms, wherein the water container (2) at least partly underground in the ground (5). It is proposed that the water container (2) as deep into the soil (5) extends, at least at the bottom of the water container that (2) there is deep sea printing. Also the invention relates to an operation method therefor.