Open Collar for Multi-Cable Towing System

A marine geophysical survey system comprising:

• a plurality of source cables coupled to a survey vessel;
• a plurality of energy sources, wherein each of the energy sources is suspended beneath a flotation device coupled to a respective one of the source cables, the suspended energy source coupled to a distal end of the respective one of the sources cables and further coupled to the respective one of the source cables by a secondary lead-in line;
• a plurality of spreader lines extending between the source cables;
• and
• a plurality of open collars coupling the spreader lines to the source cables;
• wherein each of the open collars is configured to slide over an attachment point for the secondary lead-in line on the respective one of the source cables.

A method of marine geophysical surveying comprising:

• towing a plurality of energy sources through a body of water from as survey vessel, wherein source cables couple the energy sources to the survey vessel, and wherein spreader lines extend between the source cables;
• providing open collars that couple the spreader lines to the source cables;
• and
• actuating the energy sources.