![A serious challenge, trig 642 is, despite its modest height, quite possibly one of the most demanding trig pillars to bag, if you stay true to the way it would be reached A serious challenge, trig 642 is, despite its modest height, quite possibly one of the most demanding trig pillars to bag, if you stay true to the way it would be reached](https://getoutside.ordnancesurvey.co.uk/site/uploads/images/assets/Thumbnails/new%20adventure%20thumbs/Brecon%20Beacons.png)
A serious challenge, trig 642 is, despite its modest height, quite possibly one of the most demanding trig pillars to bag, if you stay true to the way it would be reached
![SAS test march officer didn't know of 'hottest day' predictions, inquest told | Military | The Guardian SAS test march officer didn't know of 'hottest day' predictions, inquest told | Military | The Guardian](https://interactive.guim.co.uk/uploader/embed/2015/06/sas_brecon_beacons_map/giv-21277s5ha7vXGm7Sm/img/SAS_Brecon_Beacons_RouteUPDATE-3-0-0.png)
SAS test march officer didn't know of 'hottest day' predictions, inquest told | Military | The Guardian
![Selection is reported to be the most demanding military training course in the British Armed Forces with a reported pass rate of Stock Photo - Alamy Selection is reported to be the most demanding military training course in the British Armed Forces with a reported pass rate of Stock Photo - Alamy](https://c8.alamy.com/comp/C13NKH/selection-is-reported-to-be-the-most-demanding-military-training-course-C13NKH.jpg)