The same sub-sitelinks are now tested by Google's desktop search interface. Sub-sitelinks are only displayed for navigational results. The experiment makes the top result a lot more prominent and shows snippets and arrows next to the regular sitelinks. The homepage title is bigger and Google uses the card layout.

Click the arrows to see the sub-sitelinks.

Here's a video:
To try this experiment, install a cookie manager extension like "Edit This Cookie" for Chrome, go to google.com and change the value of the NID cookie to:
67=bmHw1iFJSvWl2_5KKxRfyyqHcge-1Ki-6j033efhbbojYKHEFKmAUPx-XYe2dHQi0a8mu_CqdbVH5ir0J4ZNKv7QXl_uftc7XY7Mx5UXge1RRKNpmH6Q-q9v-gfYfsbZ

If you use "Edit This Cookie", don't forget to click "Submit changes". Delete the NID cookie to opt-out from the experiment.
{ via Techno-Net }