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Recent numerical relativity simulations of mergers of binary black holessuggest that the maximum final value of $a/M$ is $\sim 0.95$ for thecoalescence of two equal mass black holes with aligned spins of the samemagnitude $a/M=0.994$ which is close to the upper limit $a/M=0.998$ ofaccretion spin-up shown by Thorne. Using the WKB method, we suggest that ifquasinormal modes with $a/M \sim 0.95$ are detected by the second generationgravitational wave detectors, we could confirm the strong gravity space-timebased on Einstein's general relativity up to $1.33M$ which is only $\sim 1.014$times the event horizon radius and within the ergoregion. One more messageabout black hole geometry is expected here. If the quasinormal mode isdifferent from that of general relativity, we need to find the true theory ofgravity which deviates from general relativity only near the black holehorizon.

The detection of quasinormal mode with $a/M \sim 0.95$ would prove a sphere $99\%$ soaking in the ergoregion of the Kerr space-time