The dingy brought us to the entrance of Horseshoe Bay (Rinca Island) for a dive and we saw a small boat departing as we got there. After the dive we surfaced among all these dead fish. We think the boat we saw leave had dynamite fished right before we showed up and fled when they saw us. This devastating unsustainable fishing practice is illegal but still occurs. One of the saddest endings to a beautiful dive I've ever experienced.