You cannot know that there is a leak in the tubes they are just giving a description of the tubes.
This justifies what answer for what question? Q & A:
Premise: "A shirtless man and another in a gray shirt are looking at large blue and yellow corrugated tubes going down into a blue rimmed hole."
Hypothesis: "The men looked at the tubes trying to figure out where the leak was."
Do we know that the hypothesis entailed by the premise?
it is not possible to tell