Divers once believed the Great Blue Hole was bottomless; then explorers discovered human remains deep inside

<iframe
  src="https://hindustansphere.com/embed/cluster/77a9572575ddd06b3f511cf3e4254389b6ef5880"
  width="100%" height="320"
  style="border:0;max-width:680px"
  loading="lazy"
  title="Divers once believed the Great Blue Hole was bottomless; then explorers discovered human remains deep inside"></iframe>