Abstract: The invention relates to a diving tube, formed by several tube sections (3-5-7-10), manufactured in a rigid or semi-rigid material, attached to other intermediate sections (4-6-9) and to a mouthpiece-type end part (11) manufactured in a flexible and deformable material, which are alternately coupled to one another by tonguing and grooving, such that the parts forming it can be disassembled from one another and can be coupled forming various configurations, lengths, or with various orientations of the final tube (1), both sideways and rearwards, hydrodynamically, to adapt to the forward movement in the water.