The basement built by Andiken had good bombproof capabilities. When it was being built, he had taken safety issues into consideration. Hence, the small-scale suicide bomb beside the elevator didn't shake the entire basement at all. After a short tremor, the illegal militants hiding under the basement moved out.
Lardner did suspect that the Chinese might have sent people to rescue the four scientists. At first, he didn't think about this until Andiken told him that Curry did want to kidnap the scientists last night but didn't succeed.
With Andiken's reminder, Lardner had a huge suspicion about whether the Chinese had sent people to save their scientists. However, he still didn't think of using a dead soldier as a trap. He only sent people because of Andiken's reminder.
