I have built an underwater station, very simular and inspired by The Looking Glass station from the TV show Lost. The Looking Glass was an underwater station used by the Dharma Initiative. Its purpose was to ping ships and block radio signals coming from or to the island. The station inspired me to build it in Minecraft. I have also built the Swan station (aka the "Hatch") the Orchid, and the Hydra. If you'd like to see my take on The Looking Glass first hand, visit my server, it is posted on my profile.