...you float into the ODS (Orbite Docking System)
from Shuttle's airlock through tunnel extension ( also serves
as EVA airlock ). The tunnel leads further to the
Shuttle's back where Spacelab is placed.
But more interesting things lie in other direction.
You move upwards...
...and see a closed hatch.
It's time to open it!
Yet another closed hatch - but it's not the Shuttle's,
it belongs to the Russian space station Mir.
Open it - and you are in the Mir's docking module