Which type of rope construction is not typically used in water rescue?

Yarn core rope construction is not typically used in water rescue due to its inherent vulnerability. This type of rope generally features a core made up of yarns that provide little to no structural integrity. When subjected to the harsh conditions commonly found in water rescue situations, such as abrasion from rocks and other debris, yarn core ropes can fail to maintain their strength and reliability.

In contrast, double braid, laid rope, and static rope constructions provide greater durability and performance characteristics that are essential for rescue operations. Double braid ropes have a strong inner core and a durable outer sheath, offering excellent handling and resistance to wear. Laid ropes are twisted together in a way that enhances strength and flexibility. Static ropes, specifically designed for rescue, have low stretch, allowing for secure and predictable load handling under rescue scenarios. These attributes make them preferable choices for water rescue operations where safety and reliability are paramount.