Main.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Timers;
using SpaceEngineers.Game.ModAPI;
using Sandbox.ModAPI;
using Sandbox.Game;
using Sandbox.Game.Entities;
using Sandbox.Game.Entities.Cube;
using VRage.Game;
using VRage.Game.Entity;
using VRage.Game.ModAPI;
using VRage.Game.Components;
using VRage.Utils;
using VRageMath;

[MySessionComponentDescriptor(MyUpdateOrder.NoUpdate)]
public class Main : MySessionComponentBase {

    private Logger logger;

    public override void Init(MyObjectBuilder_SessionComponent sessionComponent) {

        base.Init(sessionComponent);

        logger = Logger.getLogger("AlwaysSpawnWithoutHydrogen");

        /* Add Listener */
        MyVisualScriptLogicProvider.PlayerSpawned += PlayerSpawned;

        logger.WriteLine("Initialized");
    }

    protected override void UnloadData() {
        base.UnloadData();

        MyVisualScriptLogicProvider.PlayerSpawned -= PlayerSpawned;

        if (logger != null) {
            logger.WriteLine("Unloaded");
            logger.Close();
        }
    }

    private void PlayerSpawned(long playerId) {

        //logger.WriteLine("Request of Player "+ playerId);

        IMyIdentity playerIdentity = Player(playerId);

        //logger.WriteLine("Found Identity " + playerId);

        if (playerIdentity != null) {
            //logger.WriteLine("Player is " + playerIdentity.DisplayName);

            var playerList = new List<IMyPlayer>();
            MyAPIGateway.Players.GetPlayers(playerList, p => p != null && p.IdentityId == playerIdentity.IdentityId);

            var player = playerList.FirstOrDefault();
            if (player != null)
                MyVisualScriptLogicProvider.SetPlayersHydrogenLevel(playerIdentity.IdentityId, 0);
        }
    }

    private IMyIdentity Player(long entityId) {

        try {

            List<IMyIdentity> listIdentities = new List<IMyIdentity>();

            MyAPIGateway.Players.GetAllIdentites(listIdentities,
                p => p != null && p.DisplayName != "" && p.IdentityId == entityId);

            if (listIdentities.Count == 1)
                return listIdentities[0];

            return null;

        } catch (Exception e) {
            logger.WriteLine("Error on getting Player Identity " + e);
            return null;
        }
    }
}