As the interfacial water layer hinders the formation of interfacial contacts and intermolecular interactions between the adhesive and the substrate, in almost all cases of underwater adhesion, water molecules typically act as a destroyer, resulting in poor adhesion.
Working underwater, inside the lumen among the brush, helps tremendously the Borescopists to analyze and understand which particles are classify as debris and which ones are sticked to walls as biofilm or matter so they can be quickly brush and removed.