Projected rises in sea levels could damage internet connectivity for large parts of the globe by submerging major cables and data centers. Cities like New York, Seattle, and Miami have been named as the highest risk. Existing cables for most of the internet infrastructure are buried underground and can withstand water and weather to a certain point. They are not, however, designed for submersion in seawater. Countering this threat would require extensive improvements to materials, plans, and systems.
Source: Thousands of Miles of Internet Cables Could Be Underwater by 2033 – Nextgov
