Article Photos: Report: Swells affected Puerto Rico glowing lagoon 1/1

FILE - This April 1, 2005 file photo shows the Fajardo Grand Lagoon at the Nature Reserve of Las Cabezas de San Juan at dawn, about 35 miles east of San Juan, Puerto Rico. Biologists are investigating why the bioluminescent bay off the northeast coast off the Puerto Rican coast has lit up once again, Friday Dec. 6, 2013, as scientists wrap up their investigation into why it went dark last month, officials said Friday (AP Photo/Herminio Rodriguez, File)