Okay, took a quick look at this since it hit page 3 with no replies. Here are my thoughts:
First off, your formatting is all over the place. The standard format for the first heading is "Item #:", and you don't need to bold everything in the first two lines. The containment and description sections are missing a colon, and the text following those bolded headers should come immediately after, not on the line below.
With regards to the containment, the specific requirements seem rather ridiculous. 21 meters is about 68 feet, which is almost the height of a 7-story building. That's more of a warehouse than a chamber, and seems pretty unnecessary. You also have some confusingly-worded sections, like " guards surveying SCP-xxxx-a-1 are to alert the head advisor of re-dialling of SCP-xxxx-a-1". Also, the instructions given are pretty vague so far as procedures go, and that could present a safety liability for the people in charge of containment. Something like "If a historical event is to occur, help from Site-██ via remote control drones are to be sent to dial SCP-xxxx-b" is excessively wordy and all you really would need is "should a historical event occur, remote drones are to dial SCP-XXXX-b" or the like. I recommend reading this guide on containment to get a feel for how to write more logical, resource-conserving procedures.
With regards to the description, it's similarly confusing and excessively-complicated. For one, it's never even stated what SCP-XXXX actually is. You only have sub-designations defined. The clock is pretty enormous—10 meters is about 33 feet, taller than a 3 story building. Furthermore, I don't think carbon dating would work on metal, and carbon dating itself probably wouldn't be able to pinpoint something as old as a trillion years. There's a lot more bad science in the description in general as well, which makes it difficult to take the writing seriously. Also, please properly space out your paragraphs.
Overall, this will need a lot of work if you want it to stand a chance on the mainsite.
I recommend getting the base idea polished up in the Ideas and Brainstorming forum before you try fixing the draft. Go to that forum, post a quick summary of the concept you want to write up (don't link the draft unless someone asks), and reviewers there can help you make the idea more interesting and give you some advice on structuring the eventual article for smoothness of reading and narrative.
