This will be an endurance challenge.
You will be on a rope.
Every 5 minute you must say "XX:XX still here"
For example:

When you start, you type: "00:00 still here"
After five minutes, you type: "00:05 still here"
After ten minutes, you type: "00:10 still here"
.
.
.
After 1 hour and 5 minutes you type: "01:05 still here"

Occationally I will say "splash water", and the person who responds "fight water" the fastest will automatically advance 10 minutes.
The last person standing will advance to part 3 of HOH.