There are 4 active long range radar stations on the Alaska Arctic coast, part of the Northern Warning System, out of 21 Distant Early Warning (DEW) stations that were built during the Cold War. Several of the remaining stations are being threatened by shoreline erosion. Erosion is mostly caused by wind-generated waves during ice-free conditions in the Beaufort and Chukchi Seas. Longer periods of an ice-free ocean will cause more frequent wave attack on shoreline permafrost. Read more here and here. Click here to download the CoastView app and explore Barter Island and the Beaufort Sea coast.