Typically on catamarans you see hatches like the one Lauren is coming out of. She, by-the-way, is part of the commissioning team that puts the boat together with her uber-knowledgable husband.
In the following photo I am coming out of the starboard locker with the larger locking hatch. This hatch can be on both sides for the bicycles. This is the locker the Triumph 125cc was in.