At the time it was 200 m deep and they managed to deepen it to 360 m. During an expedition in August 2004 they discovered Vyatskaya cave, in the same area.

[8] Only Stones ended with a large collapse while Vyatskaya continued, so they made several further expeditions into it, after several years it was 453 m deep.

In November 2002 there was one more trip to the bottom: Demidov, Kostya, Petya, Grigory Sanevich (Grisha), also with Danila and Filip Cherednichenko from St. Petersburg.

In 2015 they decided to try the meander with draft and with little digging they reached another shaft, at an estimated depth of 360 m, where they stopped because of lack of rope and time.

At the bottom of the last, 30 m shaft, Yevgeny Kuzmin discovered a continuation, Babatunda, the biggest hall in the cave, 155 m deep.

[24] Next expedition in February 2017 used a helicopter to get to the entrance and reached the depth of 1832 m, Veryovkina cave became the second deepest in the world,[25] after Krubera-Voronya.

The achievement brought Perovo-speleo team, represented by Demidov, UIS Prize for 2017 in the category The most significant discovery/exploration.

[26] In early August 2017 cavers of Perovo speleo club descended to −2155 m, where they found a siphon and returned.

In mid-August Perovo-speleo team, with Czech caver Zdeněk Dvořák, mapped 7 km of new horizontal passages, reached an underground river with a flowrate of 500 liters per second and two terminal siphons at the depth of 2204 m.[27][28] Veryovkina became the deepest cave in the world.

[29][30][31][32] In February 2018 a small expedition of 4, led by Demidov, reached 2212 m, final depth of the cave, at the bottom of the Captain Nemo siphon.

[40] Demidov also helped to promote scientific research in the cave, where it is possible to access an extensive net of passages below −2000 m without diving,[2] from temperature and water pressure measurements to search for new fauna species.

[50] In November 2012 Demidov visited Gran Caverna de Santo Tomás in Viñales, Cuba, in August 2013 caves in Northern Macedonia and in August 2014 he participated in another CAVEX team expedition to Spain, to Sima de las Puertas Illamina (BU56).

[55] Demidov joined a CAVEX team expedition to the Integral cave, situated north of Veryovkina, 2,345 m above sea level, and the depth of 200 m. On 23 August, he and Stanislav Khomyakov came to the meander, which was the last explored point of the cave, at a depth of 305 m. The meander begins with a narrow passage among stones and boulders at the bottom of a collapse hall.

Demidov went back to fetch a rope, and Khomyakov remained to clear the ledge of loose stones.