Among the hardened concrete bags, storm swells continue to unearth the occasional ampoule.

BBC: Wreck diving in Bermuda

Rather it is knowing which doors — or more accurately, which hardened-concrete barriers protecting deeply buried covert bunkers — have something of interest behind them.

CENTERFORSECURITYPOLICY: Center for Security Policy | Don’t Go There: Why President Bush Should Tell the U.N. Why Saddam Must Go, But Not Seek Its Approval for Doing So

Rather it is knowing which doors -- or more accurately, which hardened-concrete barriers protecting deeply buried covert bunkers -- have something of interest behind them.

CENTERFORSECURITYPOLICY: Center For Security Policy