Shelter for tin miners

Above Tubby's Head (St Agnes Head in the distance). The tin mines were some way away from the nearest villages and towns. As well as having to descend and ascend many 100s of feet and also walk a long way out under the sea bed, the miners had to get home as well - sometimes another couple of hours walk! After dark this wasn't always possible and a few shelters were constructed to allow the miners some respite from adverse weather conditions overnight. Countless fierce storms have reduced them to mere shells but they wouldn't have been luxurious to start with!
It's true they didn't work 24 hour shifts even if day and night meant nothing down below but they did work long stints and at full production, the mines did produce tin round the clock!
And we think we live in hard times!