 
<translate> Iji zaa ajụjụ a, anyị kwesịrị ịmara na: Dean's Blue Hole bụ oghere nke abụọ kasị dị omimi a maara n'ụwa nke nwere mmiri nnu na-acha anụnụ anụnụ nke nwere ọnụ ụzọ dị n'okpuru oké osimiri. Ya mere, azịza ikpeazụ bụ olulu na-acha anụnụ anụnụ nke mmiri ya bụ nnu nke nwere ọnụ ụzọ dị n'okpuru oké osimiri. <eng> To answer this question, we should know that: Dean's Blue Hole is the world's second deepest known salt water blue hole with an entrance below the sea level. So the final answer is salt water blue hole with an entrance below the sea level. 