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.
anterior cervical decompression and fusion (ACDF) a surgical procedure to treat cervical disk herniation or degeneration in the spine. A diskectomy is performed on the patient, who is under general anesthesia and supine, with the neck extended by a small shoulder roll placed horizontally. Fusion of a bone graft, either an autograft from the patient's iliac crest or an allograft from a bone bank, preserves the disk space and provides spinal stability.