It started when I saw the odd rune looking symbol on a chart. As a matter of fact when I first saw them, this entire island was surrounded by these mysterious runes. An odd sort of curvaceous "E" with a tale hanging off it, with jagged lines adjacent. The pattern I circled was everywhere around the island.
Might they be there to scare boaters away? They certainly would discourage me. A special symbol for old naval mines? Maybe they mark active volcanic vents. Could this be? And why is there an airfield on this tiny little island so near the very end of the Aleutian Islands chain?