Andrew,
Thanks for info on DAC.
Below is information on DOC, or Direct Ocean Capture. As the ocean surface water has significantly more C than the surface atmosphere, DOC likely represents a stronger CDR potential than DAC and DOC can be combined with other marine-based mitigation methods such as MCB, biomass production, Brightwater, water purification etc.
DOC, in the form of saltwater electrolysis/ocean alkalinity enhancement (which technically is a form of C conversion and not capture and thus no storage is needed), can produce H2/bio oil as byproducts and thus DOC can help address both CDR and emissions avoidance needs. DAC seems, atleast to me, to be rather weak in comparison to DOC.
Regards