http://www.ufoarea.com/puerto_aliens_good.html
On the morning of September 4, 1971, four mmembers of the National Geographic Institute of Costa Rica were flying in a twin-engined aircraft 10,000ft above Lake Cote, near the Central American state's forbidding Arenal volcano.
A special map-making camera was slung underneath their plane. It was automatic and large-format, and every 20 seconds it took another photograph of the lake beneath.
When the photographs were developed, one of the frames showed what seemed to be a metallic disc about 160ft in diameter, which had just left, or was on the point of entering, the lake. It was giving off light, and had made a sudden manoeuvre at the instant the photo was taken.
The object showed up on neither the previous frame of film nor the one afterwards. Checks on the negative eliminated tricks of the light as an explanation.
What the geographers had seen was an extraordinary but little-known phenomenon - a USO. Unidentified Flying Objects, or UFOs, have been reported for centuries. What few people realise is that USOs-Unidentified Submergible Objects - have been reported for almost as long.
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