Regularly during the surveys, ADCPs were recovered for maintenance and battery replacement. Their mooring locations were planned to coincide with a particular CTD station of the survey. During summer 2018 we decided to change the Champoton ADCP further south,  off Chenkan (Table \ref{245505}). While positioning it on its new location, during the diving maneuver we noticed that the water column was divided into what seemed two layers of water, a wide layer of warm and clear water above a thin layer of low-visibility and cold water located very next to the ocean floor. We felt curious about this phenomenon, which was unnoticeable during the recovery of this ADCP some days before off Champoton. The CTD observations (Figure \ref{322632}) illustrates the cross-shore thermodynamic distribution along the Chenkan section, where a saltier and warmer layer of water (CTSW) was located above a fresher and colder thin layer of water (CSUW), located next to the bottom of the ocean and extending for more than 15 km long. The CSUW water-type was located 10 Km away from the shore at a depth between  7 to 15 m. Very next to the shore, CTSW salinity and temperature contours showed a vertical distribution of this water-type that changed horizontally right above the location of the CSUW. The ADCP mooring was located on the CTD station before the end of the section(~ 25 km offshore).