Your friends invite you to the lake one of them suggest everyone to have off a Highcliffe into the lake below. You ask if anyone can verify how deep the lake is below the cliff, your friends dismiss your worries and encourage you to join in. You don’t want to get hurt, but everyone wants to die off the cliff what refuse and negotiation scale could you use?
I would first try to gather more information about the depth of the lake below the cliff. I would suggest maybe finding a local expert or lifeguard who may have knowledge of the lake's depth.
If that doesn't work, I would try to compromise with my friends by suggesting an alternative activity that is also fun but doesn't involve potentially dangerous stunts. I would emphasize the importance of safety and the potential risks involved in jumping off the cliff without knowing the depth of the water below.
If my friends still insist on jumping off the cliff, I would firmly stand my ground and refuse to participate. I would explain that I value my safety and well-being and cannot take such a risk without proper information and preparation. I would suggest finding a different activity that everyone can enjoy together without putting themselves in harm's way.