Megalodon's extinction might have been caused by supernova explosion

The video discusses the megalodon, a prehistoric shark that could grow over 18 meters long, with teeth measuring up to 17.8 centimeters. It went extinct around 2.6 million years ago. Recent research suggests that cosmic radiation from nearby supernovae may have contributed to the extinction of large marine animals like the megalodon. The presence of ion 60 isotopes in prehistoric seabed deposits supports this theory. These isotopes, along with muons, could have caused mutations and cancer in marine life, with the megalodon's large size and shallow water habitat making it particularly vulnerable.

What is the significance of ion 60 isotopes found in prehistoric seabed deposits?

What correlation exists between the extinction of megalodons and supernovae?