What does the monster in Qinghai Lake look like?

In mid-June, 1955, a detachment of the People's Liberation Army accompanied scientists to inspect Qinghai Lake. They *** 10 people, take two amphibious vehicles, and leave from the east side of the starfish to the other side. 1 1- 12 at noon, the weather was hotter than usual, and the lake in Qinghai was sparkling and calm. When the two cars were walking 17- 18 km, the monitor found something black and yellow 80 meters away, and its top was basically parallel to the horizontal plane. He thought he met a mossy sand dune, so he reminded the driver. "Dune" looks more than 10 meter long and about 2 meters wide. The two cars are getting closer and closer to the "sand dunes". When they are about 30 meters away from soldiers and scientists, everyone can see more clearly. Unexpectedly, this "sand dune" suddenly swayed upward, exposing the water for about 30 cm, and then sank, and a long "sand dune" disappeared!

1960 In spring, fishermen fish in the lake. The workers found that on the lake in the distance, huge waves suddenly rolled up. In an instant, a large black mass of "rock" floated from the lake, much like turtle shells and whale backs, and more like an unknown island. In a short time, the "black giant reef" shook again, set off huge waves and then sank into the water. This strange phenomenon appeared several times and the fishermen were dumbfounded. I don't know what monster can stir up such a huge wave.

1afternoon of May 23rd, 982. The lake is calm. At about 4 o'clock, the No.2 fishing boat of the Fifth Brigade of Qinghai Lake Farm began to return. Two workers standing at the stern found a huge black and yellow monster floating in the east of Haixing Mountain at 20 degrees north latitude, like a sampan, but slightly larger than the sampan, with no head and tail exposed, at least 13 meters long. The discovery of the workers spread on the deck immediately, and the helmsman quickly turned the bow and went straight to the unknown monster. When the ship was about 50 meters away from it, the monster immediately dived into the water. When diving, the monster shines like a fish skin, and a bright vortex appears on the water for a long time.