These comments are mostly about it's atmosphere, stating that the thick atmophere is "almost 97% carbon dioxide" and contains high amounts of sulfuric acid, which as a result, causes the temperature to average at "over 800 degrees Fahrenheit." And to top that off, the atmospheric pressure is "90 times greater then planet Earth's," suggesting that a submarine that was made to endure Earth's deepest parts of the ocean would be crushed on planet Venus.