If you can brave the cold and get over your worries about sharks, is it a good idea to swim in the bay's somewhat murky depths? This week, reporter Dana Cronin dives into this question about whether it's safe to swim in the bay and when it might not be such a good idea.

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This story was reported by Dana Cronin. Bay Curious is made by Olivia Allen-Price, Amanda Font, Katrina Schwartz and Christopher Beale. Additional support from Jen Chien, Katie Sprenger, Maha Sanad, Holly Kernan and the whole KQED family.