objects
You can sell items such as dinars, fish fossils, and books. However, you will not get a lot of money from selling them, their price depends on the civilization. The full cost can be obtained from itinerant merchants.
Amulets can be used to upgrade the character's abilities.
Key products are essential. They usually consist of cards and quest-related items, so don't try to sell them.
Scrap allows you to open doors in sunken submarines without risking crew members.
Scrap metal is used for cartridges, so it's better to keep it too.
Battles
At least one of the crew members, free of service and repair kits, is available to you as a fighter.
During the battle, do not forget to swim around the enemy all the time and sharply change the depth of the submarine in order to avoid an attack. Try your best as enemy torpedoes do serious damage.
Also, you can take advantage of the mines that appear here and there. Just lure the enemy and shoot at them.
Research
If you descend to a critical depth level for your sub, you will be warned, and you will have time to climb higher.
The same applies to oxygen cylinders. If you run out of oxygen, you will not suffocate immediately. Instead, you will be given a rather long warning so that you can find a place to replenish your air supplies. If you have two cylinders, and they both run out, you will lose one of them as a penalty.
Also, beware of deep sea currents.
