Final answer:
A Cautious Entry is the correct technique for entering shallow water with unknown conditions to feel for unseen obstacles.
Step-by-step explanation:
The type of entry into shallow water with unknown conditions that involves using feet and an aid to feel for unseen obstacles is known as a Cautious Entry.
This technique is particularly important when the condition of the bottom is not clear, such as in murky water or if there may be hazards such as rocks, broken glass, or other potential dangers.
By leading with the feet, a person can detect obstacles before the rest of the body comes into contact with them, minimizing the risk of injury.