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Like underwater communication (covered last month), communicating underground such as in mines or tunnels can be quite tricky. There are various techniques like using repeaters, mesh networks or ground-penetrating low-frequency radios. This article covers all that and more. by Dr David Maddison
Tratman Award Citations Tratman Award, 2019 The prestigious Tratman Award (in memory of E.K. Tratman, who died in 1978) is awarded annually for a caving-related, paper-based publication, to recognise excellence and encourage future improvement. It is one of the UK’s premier national caving awards, but is open to authors and publishers from Britain and Ireland. First awarded for the publications of 1979, the Tratman Award was administered by the Ghar Parau Foundation when the foundation was a sub-charity of BCRA, but since 2019 (presenting the awards of 2018) ...
Tratman Award Citations Tratman Award, 2019 The prestigious Tratman Award (in memory of E.K. Tratman, who died in 1978) is awarded annually for a caving-related, paper-based publication, to recognise excellence and encourage future improvement. It is one of the UK’s premier national caving awards, but is open to authors and publishers from Britain and Ireland. First awarded for the publications of 1979, the Tratman Award was administered by the Ghar Parau Foundation when the foundation was a sub-charity of BCRA, but since 2019 (presenting the awards of 2018) ...