We us to rent boats sometimes as a family thing with my dad, from memory it was at lakes enterence victoria , i remember leaving my fishing line in the water just for fun and as we were in bed going to sleep i heard the line spooling into the water , so i jump up and start reeling it in.

Out of the water comes the head of a giant fucking eel , im trying to think of an everyday object that was about the same diameter, maybe like american fire hydrant or large bread plate , the thing was fucking massive i pulled like 3 feet of it out of the water before the line snapped , all this at night half naked, dad was like im glad you didnt pull that fucking thing into the boat

Anyway that was the end of me swiming there thats for fucking sure

Im not sure if it was one of these but it was this size and this is also lakes enterence

https://www.news.com.au/technology/science/animals/fisherman-in-victorias-gippsland-region-catches-ancient-shark-with-300-teeth/news-story/9cd7019cb856e1f80bd7c90c91d0bab5

At least something very similar to this fucker