The World's Largest pearl
The world's largest pearl was discovered by a Filipino diver in a giant Tridacna (mollusk) under the Palawan Sea, Philippines in 1934. Known as the "Pearl of Lao-Tzu", the gem weighs 14 pounds and measures 9 1/2 inches long and 5 1/2 inches in diameter. As of May 1984, it was valued at US$42 million. It is believed to be 600 years old.
The Philippine Deep
The world's second deepest spot underwater is in the Philippines. This spot, about 34,440 feet (10,497 meters) below the sea level, is known as the Philippine Deep or the Mindanao Trench. The Philippine Deep is in the floor of the Philippine Sea. The German ship Emden first plumbed the trench in 1927. The world's deepest part of the ocean is the Marianas Trench, which is over 11,000 meters below the seal level.