THE PHYSICS OF BUOYANCY: Why Ship 40 Refuses to Sink! 
For the first time in spaceflight history, a 50-meter Starship upper stage completed a soft vertical landing in the ocean and remained fully intact — floating like a massive steel pontoon for days.
Why Ship 40 Is Floating So Long:
Softest Vertical TouchdownControlled engine throttling (3 → 2 → 1 engine shutdown sequence) killed nearly all vertical velocity right at the surface, preventing catastrophic structural impact or hull breaching.
Hermetic Tank Seals IntactBecause the landing did not rupture the 300-series stainless steel bulkheads, the propellant tanks remained sealed against ocean water.
Massive Empty-Volume DisplacementAccording to Archimedes’ principle, an empty 9-meter-diameter cylinder filled mostly with low-density residual gas displaces a huge volume of saltwater. This creates a strong net buoyant force — effectively turning the empty tanks into giant pontoons.
Surviving re-entry heat, landing forces, and ocean tipping without breaking apart has given SpaceX valuable real-world data on heat-shield tile durability and hull integrity.
Save this post to level up your rocket physics and aerospace structural knowledge!Do you think future ocean splashdowns should be towed back for full post-flight analysis, or left as telemetry tests? Let us know below! 
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