What if a bunch of scuba divers nosed about here? / Curtains for them, when our side-scan sonar sees them..
The phenomenon called tears of wine is manifested as a ring of clear liquid, near the top of a glass of wine, from which droplets form and flow back into the wine. It is most readily observed in a wine which has a high alcohol content. It is also referred to as wine legs, curtains, and church windows