Metal detecting motormouth Deep Digger Dan announces his plans for 2016 (for full effect, turn on the speech-to-voice text gadget...). He announces he's going to stage the biggest metal detecting challenge of all time (in an insular context). He is going to "walk all the way around the coastline of Great Britain metal detecting all the way". The stated length of the proposed journey he gives is actually slightly less than the coastline just of England, minus the larger islands, but even then, that will be a challenge, there are probably at least 80 000 individual landowners whose property the detectorist will be on, whether on the beach itself or coast path - not least the National Trust (who do not normally allow artefact hunting). Also some areas are not accessible, private property or Ministry of Defence etc. Imagine how much a backpack of all the artefacts recovered from a line 8800 km long will weigh at the end of the walk.
There is a video explaining this exploit here https://youtu.be/QQ2j5s6sFV0 and there is a diagram showing him walking all around Scotland, so the total is well over the "6000 miles" he says - and also the legislation on metal detecting finds ownership is different there.