An energy producing device, for example a submersible vehicle for descending or ascending to different depths within water or ocean, is disclosed. A heat-resistant crucible is filled with raw material and a sealant, and the raw material and sealant are heated, thereby melting the raw material into a melt, softening the encapsulant, and covering the melt from the top with the encapsulant. When two species of samples are fused together, regardless of whether or not the samples are conductors, the furnace has the function of melting the levitated samples and fusing them together while maintaining each of the temperatures of the samples, and consequently this permits realization of fusion in a state free of external interference. Such pipes exhibit an elongation at break in relation to that provided by the textile reinforcement and not with regard to the same type of elongation at break characteristic for the thermoplastic or thermoset composition. The balloon assumes the shape of the removed disc.