Lab Caches are an experimental cache type. They are often at Mega-Events. In contrast to other cache types, Lab Caches are not required to have a container and can also be located indoors. This allows Lab Cache owners to innovate and test new ideas to make geocaching even more fun.

to log a labche go to the special page 

https://labs.geocaching.com/goto/cet2018

and fill in the code that you found by doing a labche.

have fun!!