I'm not sure if this has anything to do with your mod, but one of the ships I destroyed in Scapa Flow learned how to fly.
My mod list:
Magnum_Opus_v0_0_1
Magnum_Opus_Patch_2
IRAI_0_0_30_ByTheDarkWraith
IRAI_0_0_30_No_hydrophone_on_surface_No_Aircraft_s potting
FX_Update_0_0_19_ByTheDarkWraith
NewUIs_TDC_6_8_0_ByTheDarkWraith
OPEN HORIZONS II_full
OH II Campaign Radio Messages v4
Dynamic Environment SH5 Basemod (realistic version) V2.1
Dynamic Environment SH5 Atlantic Floor V2.1
Dynamic Environment SH5 Undersea (temperate and polar) V2.1
Dynamic Environment SH5 Waves (realistic version) V2.1
Dynamic Environment SH5 Sleet For Winter Campaigns V2.1
Grossdeutscher Rundfunk With MilRad
TheDarkWraith_DC_Water_Disturbances_v2_0_SH5
Speech recognition MiTons NewUI