Over the past two weeks the Dispensational Publishing House Blog published a two-part article on what the Bible reveals about the global and catastrophic Flood of Noah’s time.
https://dispensationalpublishing.com/flood/text-actually-teach/
https://dispensationalpublishing.com/flood/actually-happened-flood/
The blog features a variety of authors on this topic and you will find all of them thought-provoking and stimulating to read. God not only dedicates nearly four chapters in Genesis to this key world event, but also speaks of it throughout both Old and New Testaments.