Are you certain? I&#x27;ve spent most of my dives in Florida springs, which can have flow rates above 100 cubic feet per second. You can basically get blown out of Devil&#x27;s Eye at Ginnie Springs if you&#x27;re not careful with your trim when ascending.<p>The downside of still systems is that any silt you stir up can kill the visibility for hours &#x2F; days, which would cause problems for light-based beacons.