探査

1. Origins, structure, and basic meaning

• Structure: 探査 is read as たんさ and is a noun and する verb for systematically exploring or surveying an unknown place, terrain, resource, or environment, often with equipment.
• Basic usage: Exploring the interior of a cave appears in 洞窟の奥を探査する, while footage of undersea exploration appears in 海底探査の映像.

2. Common pitfalls and similar expressions

• Examining an unknown area directly
  • It focuses on entering or observing an unknown area through fieldwork or instruments rather than only analyzing existing information.
• Difference from 調査
  • Compared with investigation or research in general, this word more strongly suggests exploring unknown terrain, space, or resources.