The 'OHANA project aims at combining the large telescopes of the Mauna Kea site into a large interferometer with a maximum baseline of 800 m. Infrared single-mode filbers are used to transport light from the telescope focus to the beamcombiner in the J, H and K bands. The astrophysical targets of 'OHANA are compact sources among which the central core of active galactic nuclei or the inner astronomical unit of young stellar objects. The purpose of 'OHANA is also to demonstrate the use of single-mode fibers to build large interferometers as a preliminary step towards post-VLTI interferometers. First fringes have been obtained using the two Keck telescopes with the 'OHANA system in 2005. This first result demonstrates that single-mode fibers can be used to propagate light from a telescope focus to a beam combiner in an astronomical environment. We discuss the lessons we have learned from this first experience and present the next steps for 'OHANA. We also discuss the prospects of using single-mode fibers in future kilometric baseline interferometers.