Core problem: After you capture the Headquarters, you still have to secure it before the sector is yours. The HQ randomly rolls one of two types: Build or Detonate. Players are asking which one is faster and how to actually finish it before Momentum dies or the defenders recap. Cap alone does nothing. Look at the HQ immediately after the flag flips.

1The Two Secure Types

Build to Secure (more reliable)
Finish 3 structures among 5 possible spots
Progress on a structure is never lost, even if defenders recapture the HQ for a while. Multiple players can hammer the same structure at once. That is the only real way to make it fast. You can lose the point, retake it, and the structures are still half-done.
Detonate to Secure (faster if you control the point)
Plant the bomb, defend until it blows
Once it blows, the HQ is permanently secured. Defenders can disarm at any time. That is why most players call it less reliable. If the point is quiet, Detonate is usually the quicker of the two.

2Build to Secure: Exact Steps

Build is the "we will get it eventually" option. You can lose the point, retake it, and the structures are still half-done.

3Detonate to Secure: Exact Steps

If the defenders are still spawning on it or have a strong push coming, Build is safer. Detonate only works when you control the point.

4Which One Should You Treat as Faster?

5Common Mistakes

6What Actually Speeds It Up

7Video: Both Secure Types in Action

Walkthrough of Expedition mode showing both Build and Detonate secure types with in-game footage.