At the bottom of the article it briefly mentions bringing back stuff from other planets, and that stuff could include extremophile-like life: "It is assumed th

At the bottom of the article it briefly mentions bringing back stuff from other planets, and that stuff could include extremophile-like life: "It is assumed that such life would be hardy - to survive the trip to Earth; not easy - and precautions taken would provide a very high degree of containment." So yeah, what could go wrong?