SharePoint Online2013 Team Site Deleted

Question

I created a DevGroup for myself and a new admin that is coming on board. That site is now mysteriously gone. I didn't delete the site, and no one else has access to do so. Is there an audit where I can go back and find out what happened?

Answer 1

If you have auditing enabled then i think you can check. check this article for more details: Search the audit log in the Office 365 Security & Compliance Center

But if you want to restore that deleted site collection than follow these steps.

• Sign in to Office 365 as a global admin or SharePoint admin.

• Select the app launcher icon The icon that looks like a waffle and
  represents a button click that will reveal multiple application tiles for selection. in the upper-left and choose Admin to open the Office 365 admin center. (If you don't see the Admin tile, you don't have
  Office 365 administrator permissions in your organization.)

• In the left pane, choose Admin centers > SharePoint.

• On the ribbon, click Recycle Bin.

• In the Recycle Bin, select the check box next to the site collection that you want to restore.

• On the ribbon, click Restore Deleted Items.

Restore a deleted site collection