He really wants to tell the secret but he knows he cant but like a ticking time bomb eventually itll spill
He sees sharks swimming very close to the shoreline, he knows there are moray eels living in the crevices, and the birds have their nesting grounds on the beach nearby.
German submarines may detect they are on the island has nothing to do with swimming or water.
So basically writing it as a fraction in 5 over 8 practically means 5 divided by 8. so then 0.625 actually IS ALREADY the decimal
It is knowledge. Knowledge has more power because you can think and think how to do stuff.