Just hours after a fire raced through a scuba diving boat, a memorial started sprouting up to commemorate the lives of 34 people who died trapped below decks. Days later, it has all but enveloped the sprawling harbor boardwalk where the boat, the Conception, once docked in Santa Barbara. Hundreds of flowers, framed photographs, flags, candles, seashells, swim fins and other mementos stretched for yards, some accompanied by heartfelt expressions of grief.