Given that air density at 80,000 feet is ~1&#x2F;40th of sea level[1], &#x27;ejecting&#x27; at Mach 3 there sounds... A lot more survivable then ejecting at 10,000 feet above sea level, doing Mach 1.<p>[1] <a href="http:&#x2F;&#x2F;www.engineeringtoolbox.com&#x2F;standard-atmosphere-d_604.html" rel="nofollow">http:&#x2F;&#x2F;www.engineeringtoolbox.com&#x2F;standard-atmosphere-d_604....</a>