Sleeper caches are data sites with various triggers and dangers. They are significantly more difficult than pirate data sites. Sleeper caches spawn in normal space and do not spawn in wormholes even though the sleeper connection would imply the opposite; they are not to be confused with the Forgotten Sleeper sites, which function more like combat sites.
The Sleeper Caches from easiest to hardest are:
Limited Sleeper Cache Level IV scanning difficulty
Standard Sleeper Cache Level IV scanning difficulty
Superior Sleeper Cache Level V scanning difficulty
Sleeper caches are gated deadspace pockets with size limits for entry. Each sleeper cache has its own set of dangers. They contain a mixture of containers with damaging explosions on a failed hack, timed triggers, hazardous clouds, proximity explosions and sentry guns. For details see the page for individual sleeper cache.
Sleeper caches contain sleeper components, manufacturing materials, skill books and blueprint copies for polarized weapons.
Sleeper caches were introduced with the Rhea expansion in 2014.
taken from
https://wiki.eveuniversity.org/User:K95 ... eper_NexusI have scanned down a Limited Sleeper Cache with 85.8 probe strength. That is with a Tech I frigate and all Tech I equipment. If you have the following:
Racial Frigate V
Astrometrics V
Astrometric Rangefinding IV
Core Probe Launcher II
Sisters Core Scanner Probes
1 Gravity Capacitor Upgrade I
1 Scan Rangefinding Array I
... you should have a probe strength of 107.135, which is enough to scan down a Superior Sleeper Site, the hardest site to scan down, with just a basic Tech I exploration frigate. Findings from multiple Superior Sleeper Caches indicated that 104 probe strength was the minimum. A basic rundown of the minimum probe strength required to scan down each site is listed below: tight cube formations are pretty much required:
Limited Sleeper Cache: 85.8 (approximate: less most likely won't work)
Standard Sleeper Cache: 92 (approximate: 91 didn't work)
Superior Sleeper Cache: 104