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. 2018 May 8;6:e4596. doi: 10.7717/peerj.4596

Table 1. Main characteristics of investigated underwater caves from North-East Bulgaria.

Caves Submerged Semi-submerged Length (m) Area (m2) Volume (m3) Depth (m)
Budova No Yes 50.2 240.2 936.4 3.5 to 1
Tulenova No Yes 83 692 2,150 4 to 1.2
Temnata dupka No Yes 73.7 344.5 2,291 3 to 0.5