The deep sea creatures use a sonar type system to send waves and see how long it takes to get back to them ; like a dolphin
Yes every day by other deep sea creatures.
Yes there are many unidentified creatures in the sea. There are parts of the sea that are so dark that only creatures with special adaptations can live there. There are also parts of the sea that are so deep that we cannot go there. The pressure collapses submarines.
None, the deep sea is in space
Antarctica is a continent. No sea creatures live on land.
The abyss is a deep-sea region with extreme conditions, such as high pressure, low temperatures, and lack of sunlight. Some creatures that can be found in the abyss include anglerfish, giant squid, deep-sea jellyfish, and various types of deep-sea worms and crustaceans. These creatures have adapted to survive in this harsh environment by developing unique features and behaviors.
Not generally. They are deep sea creatures, and do not come so close to shore, usually.
The Titanic wreck is now home to a variety of deep-sea creatures such as bacteria, fungi, and invertebrates like sea stars and anemones. These organisms thrive in the cold, dark environment created by the sunken ship.
Some dangerous deep sea creatures would include: the giant squid, frilled shark, anglerfish, and goblin shark. Most deep sea creatures pose no threat to humans as they are located at depths in which you would need a submarine to reach.
They use other sources of energy. Like geothermal waters, or just food.
sea rabbitts
Some deep-sea creatures like tubeworms and certain bacteria do not rely on sunlight for their energy. They instead use a process called chemosynthesis to produce energy from chemicals found in their deep-sea environments.