The invention relates to the detection of cracks in a frame of the marine flat - form a tubular elements enlaces to each other in leakproof manner. / p & & p & this detection is effected by means of sensors 505, 515, 525, 535, 545, 425, 635.. Mounted on at least some 500, 510, 520, 530, 550, 420, 630.. These tubular elements for we shall now describe the passage of a fluid through a wall of the tubular element, in particular by measuring the pressure in the elements placed initially in the overpressure.
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