用 1314 hegar 测深杆完全测深

• 00:01
• 00:08
• 00:15
• 00:22
• 00:29
• 00:36
• 00:43
• 00:50
• 00:57
• 01:04

Sounding with a 13/14 mm Hegar sounding rod all the way inside.

• 1,010
• 01:10