On January 1, 2018 angry aliens decide to show humanity just who's boss. So they vaporize an area of land 1 mile deep and 10 wide, centered around the Panama Canal.
Some preliminary facts that we know:
The Pacific side is ~20 feet higher than the Atlantic, due to the pressure of a current. I anticipate a huge flow of water from the Pacific side, which might initially scour the new passage larger, and would likely persist as the equatorial counter current pushes through.
The former isthmus has separated the two oceans for millions of years; there has been some recent leakage due to the Canal, but in "retail" amounts not wholesale.
What are the effects on our ocean ecosystems?