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Multiplicity is one of the most fundamental observable properties of massiveO-type stars and offers a promising way to discriminate between massive starformation theories. Nevertheless, companions at separations between 1 and 100mas remain mostly unknown due to intrinsic observational limitations. [...] TheSouthern MAssive Stars at High angular resolution survey (SMASH+) was designedto fill this gap by providing the first systematic interferometric survey ofGalactic massive stars. We observed 117 O-type stars with VLTI/PIONIER and 162O-type stars with NACO/SAM, respectively probing the separation ranges 1-45 and30-250mas and brightness contrasts of Delta H < 4 and Delta H < 5. Takingadvantage of NACO's field-of-view, we further uniformly searched for visualcompanions in an 8''-radius down to Delta H = 8. This paper describes theobservations and data analysis, reports the discovery of almost 200 newcompanions in the separation range from 1mas to 8'' and presents the catalog ofdetections, including the first resolved measurements of over a dozen knownlong-period spectroscopic binaries.  Excluding known runaway stars for which no companions are detected, 96objects in our main sample (DEC < 0 deg; H<7.5) were observed both with PIONIERand NACO/SAM. The fraction of these stars with at least one resolved companionwithin 200mas is 0.53. Accounting for known but unresolved spectroscopic oreclipsing companions, the multiplicity fraction at separation < 8'' increasesto f_m = 0.91 +/- 0.03. The fraction of luminosity class V stars that have abound companion reaches 100% at 30mas while their average number of physicallyconnected companions within 8'' is f_c = 2.2 +/- 0.3. This demonstrates thatmassive stars form nearly exclusively in multiple systems. Additionally, thenine non-thermal (NT) radio emitters observed by SMASH+ are all resolved [...]

Southern Massive Stars at High Angular Resolution: Observational Campaign and Companion Detection