This is one of the traditional caches on the series, I hope this will challenge you.
Please note any caching activity you undertake is at your own risk. If you aren't sure you can get yourself out of a situation don't attempt it.
You do NOT need to risk your own safety if you feel unable to retrieve cache safely. Stay safe.
There are no clues for this cache and please no spoilers or even hints for others.
The other caches in the series are
CMS 1
CMS 2
CMS 3
CMS 4
CMS 6.0
CMS 6.1
CMS Bonus