Under which condition is a person mandatory (Wajib) to search for water up to the physical boundary of 400 paces?

Tayammum: Pillars, Sunnahs, Water Search, and Invalidators

• In all travel scenarios, regardless of suspicion.
• If they strongly suspect the proximity of water and safety is guaranteed (Ma' al-Amn).
• Only during winter.
• Only if safety is threatened by enemies.