What happens 60 seconds after activation of the PDM?

The correct scenario that takes place 60 seconds after the activation of the PDM (Pyrotechnic Detonating Mechanism) is that tripwires are launched. This action is part of the mechanism's designed function to ensure that any intruder or unauthorized individual in the vicinity is detected or triggered into a specific response.

Understanding the context, the tripwires serve as a critical component for security and responsiveness in various UXO systems. Implementing this feature helps enhance safety measures or leads to an alert or detonation in the case of threats. The deployment of tripwires within the first minute of activation is a strategic mechanism that illustrates the immediate responses that can follow system activation.

Other choices do not align with the typical response sequence following the activation of a PDM. For instance, self-detonation might suggest an immediate explosion, which is not characteristic of a controlled mechanism operation but an unintended failure. Entering a self-check mode implies that the device assesses its operational status, which doesn't directly relate to the triggering of tripwires. Similarly, disarming the device would occur later in a different context, rather than shortly after activation. Thus, the launching of tripwires stands out as the expected immediate action post-activation.