Multifunctional auxiliary diving device for bathyscaph and operation method

The invention relates to a multifunctional auxiliary diving device for a bathyscaph and an operation method.The multifunctional auxiliary diving device comprises a diving vehicle body and a bottom-sitting shell assembly which are installed in a matched mode, the diving vehicle body structurally comprises a pressure-resistant cabin, a hydrogel film is arranged on the outer surface of the pressure-resistant cabin, and an optical cable extends out of the top of the pressure-resistant cabin; the optical cable penetrates through the hydrogel film and then is externally connected with a buoy; the bottom-supported shell assembly structurally comprises a horn-shaped bottom-supported shell, a cylindrical shell of a hollow thin-wall cylindrical structure is installed on the top of the bottom-supported shell in a matched mode, a flow channel is formed in the middle of the cylindrical shell, and a pressure-resistant cabin pasted with a hydrogel film is arranged in the flow channel. An upper limiting ring is installed on