The most important underwater being for the Ojibwa is Mishipeshu, which means the Great Lynx …. or Underwater Panther.
This fantastic dragon-like animal resembles a feline with horns, symbols of his power.
The very ancient Pictograph of Mishipeshu at Agawa Bay:
View from the Agawa Pictograph’s on Lake Superior.
Although the most important enemy of the Mishipeshu and other underworld reptiles was the Thunderbird, these also had to face the destruction programmed by Nanabozo in the myth that tells how the world was destroyed by a catastrophic flood.
Source: https://www.thecanadianencyclopedia.ca/en/article/mishipeshu