Essentials/Essentials/src/main/java/com/earth2me/essentials/commands/Commanddepth.java

package com.earth2me.essentials.commands;

import com.earth2me.essentials.User;
import org.bukkit.Server;

public class Commanddepth extends EssentialsCommand {
    public Commanddepth() {
        super("depth");
    }

    @Override
    public void run(final Server server, final User user, final String commandLabel, final String[] args) throws Exception {
        final int depth = user.getLocation().getBlockY() - user.getWorld().getSeaLevel();
        if (depth > 0) {
            user.sendTl("depthAboveSea", depth);
        } else if (depth < 0) {
            user.sendTl("depthBelowSea", -depth);
        } else {
            user.sendTl("depth");
        }
    }
}