Kayaks In The Underground Mine

we got some friends together and went into this massive underground mine to explore inside. the water was incredibly deep and most of the time we couldn't see to the bottom leaving most of the mine unexplored. what's down there?.... while exploring we found a cracked kayak missing an owner... who's kayak did we find and how did it get there? After getting out of the mine several tires had been slashed on the vehicles in our group of explorers. someone wasn't happy about us trying to find out the answers....