The Glowing Sea

The Glowing Sea is a main quest in Fallout 4.

Detailed walkthrough
Kellogg's memories and Doctor Amari's advice indicate that the Sole Survivor should locate an escaped Institute scientist, Virgil. His last known position was deep in the most irradiated region of the Commonwealth: the Glowing Sea.

Before embarking on this quest, consider how to deal with high radiation levels for an extended period of time. A hazmat suit or power armor are viable options. The hazmat suit bears the advantage of allowing you to move at full speed and sneak more easily, but offers no protection against attacks. Power armor has high ballistic & energy resistance, but you will move more slowly and requires fusion cores. If all else fails, procure a normal gas mask (often worn by raiders), and acquire large quantities of Rad-X and RadAway.

Once you've prepared, travel to the Edge of the Glowing Sea and head southwest, following the remains of the freeway until the Pip-Boy indicates a hike off-road is in order. Expect to face deathclaws, radscorpions, feral ghouls and other irradiated wildlife. When reaching the map marker, the Sole Survivor will find themselves close to the Crater of Atom, a site holy to followers of the Church of the Children of Atom.

Upon entering the location, the strange cult, led by Mother Isolde, will inform the Sole Survivor that they are, in fact, trespassing. Though violence is always an option (search the area for a scrap of paper indicating a nearby cave), it is possible to lower one's weapon and speak to Mother Isolde instead. Answer her questions politely, and she will give directions to a rocky cave nearby.

Locate the rocky cave roughly southwest of the Crater of Atom, being wary of the roaming deathclaw in the area. Virgil will be found inside this cave. He requests that the Sole Survivor help him locate a serum within the Institute, in return for his knowledge.

Bugs

 * Upon entering the cave, Virgil is not there. The marker for finding him points to the ground. This may be the result of having visited Virgil's cave prior to the quest.
 * On PC, using console command and then  may force Virgil to appear in the cave.

Das Leuchtende Meer Mar Resplandeciente (Misión) La Mer Luminescente O Mar Reluzente Светящееся море (квест) Море, яке світиться (квест) 發光海(任務)