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![SpaceflightNow Avatar](https://lunarcrush.com/gi/w:24/cr:twitter::17217640.png) Spaceflight Now [@SpaceflightNow](/creator/twitter/SpaceflightNow) on x 509K followers
Created: 2025-07-21 21:08:52 UTC

The so-called 'big vent' is now underway at pad XX as SpaceX thermally conditions the feed lines ahead of second stage liquid oxygen loading on its Falcon X rocket. Liftoff of the O3b mPOWER satellites is set for 5:27 pm ET (2127 UTC).

Watch live:

![](https://pbs.twimg.com/media/GwaREN8XsAAjDAu.jpg)

XXXXX engagements

![Engagements Line Chart](https://lunarcrush.com/gi/w:600/p:tweet::1947403425035264369/c:line.svg)

**Related Topics**
[loading](/topic/loading)
[liquid](/topic/liquid)
[spacex](/topic/spacex)
[pad](/topic/pad)
[underway](/topic/underway)
[vent](/topic/vent)
[spaceflight](/topic/spaceflight)

[Post Link](https://x.com/SpaceflightNow/status/1947403425035264369)