Bottle Message

Bottle messages are both a collection of miscellaneous quests and a series of paper notes in Fallout 4. Collecting each one gives the Sole Survivor a quest marker to find a single levelled loot caches.

Locations
Bottle message 1 is located behind crater house, slightly East-Northeast on the shore. Look for some barrels going from crater house to Salem all the way from the shore. Taking the bottle creates a miscellaneous objective on the water surface, swim past the big white and red boat and the wrecked plane. Dive down untill you find a big sewer/pipe and you will see the flipped boat, looting the steamer trunk inside completes the objective.

Bottle message 2 is located behind The Castle, not far from the South-South-East most Star point. Near the water edge, not far from a largish rock standing by istelf near the water. Only the top of the bottle is visible. Taking the bottle creates a miscellaneous objective on the water surface just North West of Spectacle Island. The thin antenna of a submerged boat is just above the surface. Diving down to the boat and taking the loot in the steamer trunk completes the objective.

Bottle message 3 is located near the lighthouse, south of the Wreck of the FMS Northern Star. The bottle can be found on the sand bar with a red buoy, directly west of the lighthouse. After picking up the bottle, a miscellaneous quest marker will appear east-southeast on the surface of the water. Diving below and opening a hatch door in the waste pipe, one can find a first aid kit and a steamer trunk. The objective is completed once the steamer trunk is opened.

Bottle message 4 is located at the south-east point of Boston Airport peninsula, on the beach facing the Fort Strong between a giant driftwood and several wooden planks. After picking up the bottle, a miscellaneous quest marker will appear southeast on the surface of the water. Diving down, the wreckage of a Horizon Airlines plane will be found, taking the loot in the steamer trunk completes the objective.

Bottle message 5 is located behind Mahkra Fishpacking, South East corner, across from the rowboat with the Plastic pumpkin on it. When picked up, it marks a location on the surface of the water near a Buoy East of the packing plant with a miscellaneous objective. Diving deep below that marker is a sunken bathtub with a skeleton holding a teddy bear inside and some other items. Also a steamer trunk with assorted loot (spawned on opening the bottle message) is located in the tub. Taking this loot completes the objective.

Bottle message 6 is located by the Nahant Oceanological Society, on the tiny sand island just off the coast to its south east. The marker for this message is in the middle of a large expanse of water, very roughly south of Croup Manor and Nahant Chapel and roughly east of Nordhagen Beach. The dive to the boat is also very deep, and it is easy to become lost in the murky water, waterbreathing via Aquaboy or Mirelurk cake is recommended.

Behind the scenes
The fifth bottle message is a reference/easter egg to Bruce Willis saying the quote in Die Hard, sarcastly refering to his situation while climbing through a vent in the Nakatomi tower taken over by terrorists.

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