The Mainstream Titan Submarine w/Bubble on Top has a crawl through tunnel and is a fantastic addition to the toddler area! Sturdy Birch Plywood construction with unbreakable Lexan windows and bubble. Doorway cutout is open to the floor to prevent injury and window cutouts are beveled to discourage climbing. For 12 to 36 months. 59"w x 32"d x 36"h. Assembly time is approximately 5 - 10 minutes. Hardware, Loctite and Allen wrench included. Lifetime warranty.