Final answer:
The specific depth of the cave Klimchouck's team aimed to explore is not provided in the information given. Other caves' depths are mentioned, with one cave being eleven meters deep.
Step-by-step explanation:
The depth of the cave that Klimchouck's team set out to explore is not specified in the provided information. However, we have details of several other caves and their respective depths. For example, the Apollo 11 rock shelter has a cave that is eleven meters deep. The Chauvet Cave was sealed for over 36,000 years and contains prehistoric drawings, but its depth is not mentioned. Regarding the attempted exploration depth in a different context, the project goal for drilling was 15 km, but technical challenges prevented going deeper. The text also references the deepest mine being less than 4 km and the deepest drill hole about 12 km deep, but these do not directly relate to Klimchouck’s cave exploration.