Can you guess what caused the accident?

Looks like a tail rotor problem.

Bank into the direction of the turn to increase radius and eventually airspeed and tail rotor effectiveness while allowing a gradual reduction in torque thus increasing tail rotor effectiveness. Think Reverse corkscrew. His rpm of the rotor was too low, and got below the threshold for control at that altitude. High altitude operations require a lot of training and experience to avoid this.

density altitude leading to loss of tail rotor effectiveness?

Everyone knows helicopters can’t swim

I’m no expert, but I’ll go with the lake. Looks to me like the accident began roughly around when the helicopter made contact with the lake.

the law caused it. Gravity, it's not just a good idea, it's the law.

Female pilot?

Lost tail rotor authority due to altitude, temperature, no wind, density altitude, not enough power available

Failure to maintain terrain clearance. 😃

The transfer gearbox to the tail rotor failed, causing runaway rotation on the yaw axis.

Lady pilot

Jason, you don't mess with his lake

Tailrotor malfunction

Helicopters don't fly, they are so ugly the earth repels them. For a brief moment the earth liked whirlygig thingy and it came back down.

SIMPLE: This is failing to understand the helicopter performance envelope. Over confidence & under experience. "High altitude operations require a lot of training and experience to avoid this."

yea da roto moto splashed

The water 🤷‍♂️

The spinny thing quit working right.

Did he survive?

It appears to be the water's fault.

The guy in the foreground should have been a bit more expeditious in his departure. I've seen a main rotor pop off and fly about 200 yards after the helo hit the water, although much harder and with no tail rotor.

Well, Gravity to start.

The window is open

Yes. Poor PIC decision making.

That's an expensive fishing technique.

The water is calm, no waves which means no wind This one is either pure stupidity, poor flying skills or something stuck in the pedals

climate change, rapidly rising lake level

Vortex Ring State

A blowjob

Are you gonna tell us

well - one - its a helicopter.

First impulse was tail rotor failing but in the end it was spinning, 🤔 could it be pitch control?

Tail rotor malfunction

They put the lake in the wrong spot

Female pilot.