I've been trying to identify the articulation Hans Zimmer uses at 0:38-0:42 in his song Cornfield Chase for the film Interstellar. (https://www.youtube.com/watch?v=1Vko01D77Fg)

Such beautiful works, such a shame they lack official sheets....

Although I'm pretty sure it's a crescendo, I'm unfamiliar with string articulation and would really appreciate any help