Boybuloq Cave
The cave is the deepest known cave in Asia having been explored to a depth of from the entrance. At the lowest discovered level a water-filled siphon blocks further exploration. It is thought that the cave has the potential to be the deepest known cave in the world, with a theorised depth of making it deeper than the Veryovkina Cave. The explored length of the cave is .
Harwood Hole
Harwoods Hole is a cave system located in the northwest of the South Island of New Zealand. It is one of several important cave systems in Takaka Hill, between Golden Bay and Tasman Bay. Starting at the surface as a 50-metre round entrance and descending 183 metres, Harwood Hole is New Zealand's deepest vertical shaft. Further in it connects with "Starlight Cave". The long rope descent is considered one of the most spectacular parts of the caving experience at Harwood's. Harwood's Hole has an overall depth of 357 m.