Which suspect was lying about their arrival time? Use your knowledge of waves to explain/prove he is lying.

The local gym was destroyed by an underground explosion last night at 8:30 pm. The police narrowed down the suspects to three individuals, who were in the area at that time. All three suspects were the same distance away from the "explosion" when it happened. All three claim to be innocent, but the police know one of them is lying based on the times they claimed to have arrived at the scene. They need your help to figure out who committed the crime. WHO IS THE LIAR? Suspect 1 (S. Squarepants): I was practicing underwater diving when I heard the explosion. I ran to the gym as quickly as I could, and got there at 8:35 p.m. However, I was not the first to arrive. Suspect 2 (Plankton): I was hiding in a wooden box next to the swimming pool so that Mr. Squarepants couldn't find me and force me to swim today. I was listening to my music in my earbuds , but I jumped out of the box when I "felt" the massive explosion and ran there as quickly as I could I got there at 8:40 p.m.. Two people were already there. Suspect 3: (P. Star): I was jumping on a trampoline in the park next to the pool. I was really high in the air when I saw the explosion happen. I ran to the scene as soon as I saw it After I started running. I was able to hear the explosion and feel it through the ground I arrived at the scene at 8:33 p m., I was the first to arrive at the scene The police determined that all the suspects ren at the same speech