Diving Hazards. Underwater caves and other karst features exist in the limestone formations in Lake Amistad. Do not be tempted to enter these unless you have received training and certification as a cave diver. Even at short distances, a diver can stir up silt creating zero visibility conditions instantly. Fishing is a popular activity on the lake. The resulting collection of old and new trotlines and monofilament line poses possible entanglement hazards for divers.
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