Originally Posted by Deathpit

Alligators in NY sewers? That's false fact (Mythbusters had this myth busted). Alligators cannot suvived in dark, cold sewers with little or no food. They required sun basking and warm water included fresh meatly food to feed on. Alligators in sewers (not living in but trapped) was common thing in southern states.
Here's true creepy fact: NY sewers filled with big rats not gators. Enjoy your night with sewer rats, ravensteve1961.

As for 6 feet snake...it look like Florida Kingsnake as based on my reptile guidebook. Or it's perhaps color-morph corn snake (grow to 72").
I remember it did happens in my middle school when teacher's rat snake were loose and found in a sinkhole.