California: Caltrans implodes Bay Bridge marine platforms
Engineers are taking out some of the last remnants of the original San Francisco Bay Bridge.
They conducted the first implosion Saturday, to remove 13-remaining piers of the east span of the structure.
The original 1936 bridge has been replaced with one that's earthquake safe.
The implosions will continue every other weekend until mid-November.
The state transportation department says it took steps to protect the environment and marine life.
Officials are using the so-called "bubble curtain" implosion technology that minimizes the impact on the ocean.