I did the wreck treck with them last week. That's probably one of the deepest dives they do on recreational trips. It can be 90' to the sand at some points on that drift dive. You drift over three wrecks on one dive. My max depth was 88.5' but my average depth was 71'. NDL limits will not be your limiting factor on these dives using 36% EAN. You will be limited by either gas consumption or the 45 minute time limit imposed by the operator. With the 100s with average gas consumption or better you can at least get all 45 minutes in. These are drift dives, the current can be strong on certain days. You can end up fighting the current some as you try to checkout and navigate between the wrecks. Which is why the extra gas is helpful.