The bulk of a large coastal glacier in Alaska sits below sea level and is undercut by channels, making it vulnerable to accelerated melting in an already deteriorating coastal habitat. More vulnerable to seawater intrusion than previously thought, it may retreat faster than predicted. It’s very large glacial system that could lead to loss of a significant volume of ice and National Park Service land and contribute a measurable volume to global sea level rise. This might not sound like much, but all Alaskan glaciers combined contribute about 0.2 millimeters per year to global sea level rise–a rate topping all other glaciated regions apart from the Greenland and Antarctic ice sheets.
https://www.sciencedaily.com/releases/2023/03/230317184929.htm