Many Gs of acceleration: I don't think it would be a huge problem, when lying on your back, in a g-suit or submerged in water. I don't think it would require li

Many Gs of acceleration: I don't think it would be a huge problem, when lying on your back, in a g-suit or submerged in water. I don't think it would require liquid breathing, which is not fully developed yet. Many Gs of deceleration: for the passenger, acceleration and deceleration have the same effects.