Before that year Krakatoa was a volcano ON land. After that year Krakatoa was a volcanic cauldera UNDER water.
The fellow in UK who came up with the idea said the explosion was so big it launched the magma far beyond the stratosphere ~ the result is no big deposits anywhere.
That's a giant crock. No matter how big the eruption you get deep deposits near the eruption( and downwind) and smaller eruptions farther way.