It is highly unlikely that a bomb could be used to create a cave large enough for a rover to excavate fossils or tissue from well-preserved animals within ice that is 3.5 billion years old. There are several reasons for this:
Geological Stability: Over billions of years, the Earth's crust has undergone extensive geological processes, including the formation of various rock layers and the movement of tectonic plates. The stability and composition of the rocks surrounding the ancient ice would make it challenging to create a large cave through a single explosive event.
Energy Dissipation: The energy released by a bomb explosion would primarily dissipate into the surrounding rocks, causing fragmentation, deformation, and displacement. It is unlikely that the energy would be efficiently channeled to melt a significant volume of ice without causing massive damage to the surrounding area.
Preservation of Fossils and Tissue: Even if a large cave were somehow created, the explosive force and resulting heat from a bomb would likely destroy any well-preserved fossils or tissues present in the ancient ice. The extreme temperatures generated by such an event would likely lead to the rapid degradation and vaporization of organic material.
When it comes to studying ancient fossils and preserved tissues, scientists typically rely on more controlled and meticulous methods, such as carefully excavating and extracting specimens from areas where they have been naturally preserved over time, such as sedimentary deposits or permafrost regions.
While technological advancements and innovative approaches are continually expanding our ability to study ancient life, the scenario you describe would be highly unlikely and not a feasible method for extracting well-preserved fossils or tissues from ancient ice.