As I remember, the Nautilus dive was in shallow water very near the top of a sheer wall. Those who paid for the Nautilus experience went there and those who did not went the other way and did a wall dive. When we were done with them we finished our dive on the wall as well.
The night dive we did was on the wreck of a Jake sea plane. I thought it was a spectacular dive and it is in my top 10 all time favorites. That was the icing on a super day of diving, 5 dives, the Iro wreck, the Helmet wreck, Chandelier cave, big drop off, Ngerchong inside and last but not least the Jake sea plane. I was one whipped pup after that, but as the saying goes: Sleep when you're dead !!!
Each wreck has a tale to tell about its life and its demise.
If you are observant while diving in dark places listen to the account each has to tell, You cannot come away unaffected.
Changes in Latitude, Changes in Attitude