[help] Submarine editor warning message + need info hull

#1
Hey there,

Building my first sub, right now i'm struggling a long time in submarine editor, tried to fix some stuff before asking here + google helped me allot too. Anyway some stuff i found out myself the message in screen 1 was way longer but could fix it besides this one (screen 1).


I know what a gap is --> https://barotrauma.gamepedia.com/Submar ... s_and_Gaps but if i press 'gaps' in the editor i see evrything is red (doors and hatches) i dont know the difference between red and blue (besides the colour) but some ppl saying it has to be red since blue is bad, is this true?

1) What does this exactly means? and how to fix?
Screen 1:
Image

2) What kind of consequences can this have or is it np (screen 2)? Must it be perfect connected or overlapping is good enough? Is it linked with the warning message from screen 1? or...?
screen 2:
Image

Any help/ tips is welcome <3
Thanks already for any info, help and or tips giving.

Greetz,
Madrush