system
Given the following post, respond as if you're commenting on Reddit:
human
Let's say we have a person submerged in a large tank of water, and the tank is traveling a brisk 30 mph or so. Suddenly, it collides with a stationary wall. What happens to the diver?

Would it hurt? Cause severe injury? Would the water cushion the diver better or worse than say, an airbag? People are about as dense as water is, a little less so, so would the diver actually be pushed *away* from the wall he just crashed into? What if the tank freefell onto the ground instead?
gpt
Here's some actual data (from J Aviat Med. 1958 Jun;29(6):433-7. Protection against acceleration forces in animals by immersion in water. MARGARIA R, GUALTIEROTTI T, SPINELLI D.):

* 8 out of 10 rats survived a brief acceleration of 1000g while submerged in water, while nearly 100% died during a brief acceleration of 100g without water.
* 80% of frogs and fish subjected to 150g for 1 minute lost equilibrium due to detachment of the otolith organ.
* Fish died after 24 hours of either 150g or 3000g (the paper is vague) due to an inability to feed.
* Erythrocytes were found concentrated in the "lower" half of animals after centrifugation (even live ones).
* As for using breathable liquids: rat fetuses were able to withstand brief 10,000g accelerations and develop normally.