There is no whatsoever scientific proof on global flood in recent geological times. Hydroplate theory is a pseudoscientific concept easily rebuffed by earth science peer review material.
For example there is no discontinuity of forests in the northern hemisphere since the last ice age. Wood is well preserved to analyze all the tree rings as far as back as 8000 BC. We can even trace two major volcanic eruptions in the Bronze age (Thera and Hekkla) which happened around the so called Global Flood. These two major eruptions had left deep marks upon the atmosphere and on climate, such as decrease of temperature for several decades that science can even pinpoint them with accuracy of several years in Europe, Middle East, and Asia. There are so many issues with the global Flood in 2200BC that even mainstream churches (Catholic, European Protestants, and Orthodox) accepted it as a myth. The exceptions are fundamentalist evangelical churches having grassroots support in USA.