Fine scale observations in the Antarctic Shelf in front of the fast-thinning Denman Glacier with SWOT and in situ observations reveal strong coastal currents and sub-mesoscale eddies capable of deep water-mass modification. Remote sensing observations and models have pointed to the ocean driving a great deal of the ice mass loss. The Denman Marine Voyage on-board RSV Nuyina visited the region in March-April 2025 and undertook a significant oceanographic investigation showing stunning small-scale ocean processes. SWOT observations show intense currents in the vicinity of the glacier and induced very small and strong instabilities and eddies. This was difficult to assess given the presence of the ice tongue, icebergs and sea-ice, all prone to contaminate and corrupt sea level anomalies. We developed ways to compute the balanced flow field from SWOT at smaller scales (O10km). The ship's ADCP data and iceberg drifts confirmed the strength of the currents and small, short-lived eddies. In this presentation, we focus on the small eddy dynamics which develop at the front of the glacier, in what the voyage survey revealed as a bathymetric oceanic trough. These strong dynamics, able to deepen the mixed layer from 100 to 400m in matters of a few days and a few km, induce vertical transport of heat and biology. This study highlights the step change in coastal Antarctic observability brought by SWOT.