Early Diving Milestones
| 1878 March
Nello Ottonelli reaches 23 metres in the Fontaine de Vaucluse
1880 November Lambert dives with a prototype rebreather to close a door 300metres into the flooded Severn Tunnel. Without light.
1922 Casteret passes two sumps in the Grotte de Montespan. The first successful traverse of a sumped passage.
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