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As the comments above indicate, factors like density, pressure and temperature are important for a Jupiter submariner. Of course nobody yet has the exact details of Jupiter's interior structure, but there's a diagram in http://lasp.colorado.edu/education/outerplanets/giantplanets_interiors.php that indicates the following: At the intersection of Jupiter's liquid hydrogen/solid hydrogen layer, the density is about 1 g/cm^3, which would permit the submarine to float. However, the temperature there is ~5000K, and the pressure is ~2E6 bars, so it can't be done with normal equipment.