Porous and unmonitored enough that a family can walk across and die of exposure: https://www.bbc.com/news/world-us-canada-60290955 https://www.bbc.com/news/worl

Porous and unmonitored enough that a family can walk across and die of exposure: https://www.bbc.com/news/world-us-canada-60290955 https://www.bbc.com/news/world-us-canada-60290955