Neat stuff. Still needs tethering, which makes sense while it&#x27;s being developed.<p>However, reality is no match for imagination. When I was a kid the TV show <i>Voyage to the Bottom of the Sea</i> was popular. One of the absolute coolest things was the Flying Sub[1][2]:<p><pre><code>   36 foot wide and long, flying submersible,
   aptly called the &quot;Flying Sub&quot;
   ...
   It was deployed through bomb-bay like doors.
   As it broke the surface, its engines could
   generate enough thrust for the vehicle to
   take off and fly at supersonic speeds.
</code></pre>
[1] <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;USOS_Seaview#Refit_and_the_Flying_Sub" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;USOS_Seaview#Refit_and_the_Fly...</a>
[2] <a href="https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=WHNNXVZ1mYg" rel="nofollow">https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=WHNNXVZ1mYg</a>