1990 Marine Biological Association Challenger and Scanner Pockmarks RRS Challenger Cruise 70 sediment and water column gas survey

Samples taken to determine the biology and geochemistry of the sediments within a pockmark in the basin. Distribution of subsurface and water column gases were mapped, with gas samples collected for composition and isotop analysis. Epifauna with symbiotic autotrphic bacteria were also studied to establish thier role in the ecosystem.