Natsu with Lisanna, watching over their Dragon Egg. One day, Natsu found an egg in the forest east of Magnolia. Thinking it to be a Dragon Egg, Natsu took it to the guild and asked Makarov to make it hatch, but Makarov and Erza told him that he was the only one that could make the egg hatch; through love and care.
1 As a Decompression Chamberâ This is a hyperbaric chamber used by surface-supplied divers (commercial divers mostly) to make their decompression stops.  As Recompression chamberâ A hyperbaric chamber is used to treat or prevent patients suffering from decompression sickness.
What is Decompression Sickness and What Causes It? Decompression Sickness (DCS) is a condition in which rapid changes of pressure in an environment causes gases to form bubbles of gas, mainly nitrogen. In diving, when the diver descends, nitrogen is breathed in and is dissolved in the blood and tissues.