Conveyance system and method for underwater seismic exploration

A method for delivering a payload towards an ocean bottom, comprising:

• providing a case;
• providing a cap positioned adjacent to a first end of the case;
• providing a conveyor having a helix structure and provided within the case to receive an ocean bottom seismometer (“OBS”) unit at a first end of the conveyer and transport the OBS unit via the helix structure to a second end of the conveyor to provide the OBS unit on the seabed to acquire the seismic data, a first distance between the first end of the conveyor and the cap less than a second distance between the second end of the conveyor and the cap;
• receiving, by a propulsion system of the case, an instruction to move the case;
• and
• moving, by the propulsion system responsive to the instruction, the case.