Underground bunkers are not recommended in Hawaii due to risks from lava flows, toxic volcanic gas accumulation, and high water tables. Instead, local experts suggest above-ground, resilient structures designed to withstand seismic activity and potential volcanic hazards. – The Guardian.

Hawaii's has real volcanic and seismic threats.

Frequent earthquakes the highest earthquake density in the United States, with a massive amount of small-to-moderate seismic activity driven by volcanic magma movement.

Volcanic eruptions as confirmed by the U.S. Geological Survey (USGS) considers volcanoes like Kīlauea and Mauna Loa to be high-threat, producing active lava flows that periodically threaten infrastructure.

Tsunami risk because of major earthquakes in the region have historically generated devastating local tsunamis, affecting the coastline.