In case you haven't seen it yet: This isn't directly defense-related, but it's still interesting. It's a plot created by the National Oceanographic and Atmospheric Administration (NOAA) showing the projected wave size from the Tsunami that rocked Japan on Friday. See how the chart maxes out at 240 centimeters. That's almost eight feet. There are reports the wall of water that tore through Japan was more than 12 feet high in places. Our thoughts are with the victims.
Here's another chart of the the waves: