1. people who explore caves as a hobby or sport

Examples

• The spelunkers descended into the limestone cave with their headlamps and ropes.
• Experienced spelunkers always carry backup lighting equipment.
• The cave rescue team included several expert spelunkers.
• Local spelunkers discovered a new chamber deep underground.
• Safety training is essential for beginning spelunkers.
• The spelunkers mapped the cave system over several expeditions.