TIL while laying underwater cable in the Chicago river a diver discovered a 40ft submarine. Inside he found the remains of a human and a dog. Their identity is still a mystery more than a century later.

https://interactive.wttw.com/chicago-mysteries/mystery/what-was-the-sunken-vessel-at-the-bottom-of-the-chicago-river
#til #todayilearned
https://www.reddit.com/r/todayilearned/comments/1g1rtq3/til_while_laying_underwater_cable_in_the_chicago/