Always Read to the End of the Contract

Spanish shipbuilders have constructed some very advanced submarines for the Spanish navy. They can submerge. Can they surface? Not so much.

This is amazing:

After spending nearly one-third of a $3 billion budget to build four of the world’s most advanced submarines, the project’s engineers have run into a problem: the submarines are so heavy that they would sink to the bottom of the ocean.

But other than that, they're pretty impressive.

I suggest reading up on "buoyancy."