What would happen if two black holes collided?

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When two super-massive black holes collide, the conservation of surface area leads to the release of mass-energy primarily as gravitational waves. The total area of the black holes before the collision is greater than that of the resulting single black hole, which means some mass is radiated away as energy. The radius of a black hole scales linearly with mass, while the area scales with the square of the radius, resulting in a significant difference in mass-energy. Observing such a collision would be extremely hazardous due to the immense gravitational forces involved. Overall, the collision of black holes is a complex event with profound implications for our understanding of physics.
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What would happen if two super-massive black holes collided with each other? I know it may be a very unlikely scenario.
I just started thinking about this for about a week and I wanted to see what anyone had to say about it.
Thanks!
 
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The surface area of the holes is conserved. When they collide the difference in mass-energy implied by that is released, mostly as gravity waves.

To see why, consider two black-holes of mass 1, radius 1 and thus area 1. Total area is 2, but a black hole of mass 2 has an area of 4, because the radius scales linearly with the mass, but the area with the square of the radius. To get an area of two the radius is sqrt(2) and the proportion of mass radiated away as energy is (1-sqrt(2)/2) = 0.293. Being nearby the collision of two super-massive black-holes would be incredibly unhealthy...
 
http://www.black-holes.org/explore2.html
 
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