Following two more years of planning, the Valtanen-led committee's proposal for an initial metro line from Kamppi to Puotila in the east of the city was approved after hours of debate in the city council on the early morning hours of 8 May 1969.
Setelah perencanaan selama dua tahun, proposal komite pimpinan Valtanen untuk jalur metro awal dari Kamppi menuju Puotila di bagian tomur kota disetujui setelah perdebatan selama berjam-jam di saat dini hari tanggal 8 Mei 1969.