По словам Кетраара, надо построить трансорбитальный ускоритель в системе Лёгкая вода. После этого эти тараканы навсегда заведутся в Неизвестном вражеском секторе рядом. Вероятно, в Мальстриме можно сделать то же самое

Fixed Covered pirates docking at pirate stations
Fixed Lost TerraCorp Pilot keeping Advanced Spacesuit
Fixed Being able to turn in Special Discoveries
Fixed Survival Guide "new" state being saved
Fixed Using influence with Yaki
Fixed Too many ships being created
Fixed Stop, Thief! Achievement
Fixed Asteroid Explorers Guild Reward display
Fixed UT trying to refuel with no cargo space
Fixed Ship bailing
Fixed Being able to install incompatible weapons
Fixed Installing equipment at player Equipment Docks/Xenon Hub
Fixed Freeze caused by ST/UT
Fixed Station Manager remembering prices
Fixed Interplanetary drive using Energy Cells
Fixed Complex Planner context menu
Fixed Shield check in Surrender comm
Fixed Caiman Super freighter cargo hold size
Fixed Wrong variable in Transport Location RML
Fixed Split TL being unfriendly in some cases
Fixed Paranid Trading Station being unfriendly in some cases
Fixed Paranid TP escorts not being removed from group on bail
Fixed HUB gates not being unlocked for realignment
Fixed Wrong amount displaying in steal rifles briefing
Fixed Split captain idling after leaving TL
Fixed being able to un-deploy drones while docked
Fixed Journal Page 11 not being spawned near research station
Fixed Being able to undeploy relay beacons
Fixed Terran Dynamic notoriety
Fixed Notoriety gain in Missions
Fixed Piracy Plunder ships command
Fixed Weapon Transporters staying around after mission
Fixed Outpost in 18 Billion only have 1 ware to trade
Fixed Complex Planner crashing with last asteroid mine
Fixed Deliver command being able to select stations within a complex
Fixed Fetch command being able to select stations within a complex
Fixed ware transfer after selecting Built-In Ware
Fixed changing relation of OTAS (Global Commands)
Fixed ware transfer menu of Cargo Bay Hacker having no localisation
Added Option to transfer station to hired TL while you are docked
Added Complex Planner automatically complete complex
Added Trading System Extension to all plot starts
Added Cargo Bay Hacker Software to Military outpost in Holy Vision
Added Transporter Device to Research Station in The Void
Added Trading System Extension to Research Station in The Void
Improved destination HSAP unlocking
Improved HQ display for Min/Max storage
Improved CBH ware size to S
Improved Price Calculation of used ships
Improved German Localisation
Removed Warp Tunnel from HSAP

there is a fixed number of engine tunings initially, spread out over 48 hours of game time
this is the same for ships and other things

there is also random spawns that happen at set time intervals, these are main discoveries or special discoveries, but has a small chance of other things, like engine tunings.
These ones are essentially infinite, however, there is a maximum that will be available in the game at one time, so you have to keep collecting them to get more
https://forum.egosoft.com/viewtopic.php?f=199&t=438581