The scuba gear doesn't provide oxygen (I Know how to switch modes) and when I right click on a machine with a item I crash.

Version?
Are you sure you have a Gas Mask on, as well as a Scuba Tank, with the oxygen flowing and filled?
Also, I'll need the log of the crash.

I was wearing a gas mask and a fully filled Scuba tank with the oxygen flowing and here is the crash report.

---- Minecraft Crash Report ----
// Don't be sad. I'll do better next time, I promise!

Time: 3/22/15 7:54 PM
Description: Exception in server tick loop

java.lang.NoClassDefFoundError: cofh/api/item/IToolHammer
at mekanism.common.util.MekanismUtils.hasUsableWrench(MekanismUtils.java:1414)
at mekanism.common.block.BlockMachine.func_149727_a(BlockMachine.java:612)
at net.minecraft.server.management.ItemInWorldManager.func_73078_a(ItemInWorldManager.java:376)
at net.minecraft.network.NetHandlerPlayServer.func_147346_a(NetHandlerPlayServer.java:556)
at net.minecraft.network.play.client.C08PacketPlayerBlockPlacement.func_148833_a(SourceFile:60)
at net.minecraft.network.play.client.C08PacketPlayerBlockPlacement.func_148833_a(SourceFile:9)
at net.minecraft.network.NetworkManager.func_74428_b(NetworkManager.java:212)
at net.minecraft.network.NetworkSystem.func_151269_c(NetworkSystem.java:165)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:659)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:547)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:186)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:427)
at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685)
Caused by: java.lang.ClassNotFoundException: cofh.api.item.IToolHammer
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:101)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 13 more

A detailed walkthrough of the error, its code path and all known details is as follows:

-- System Details --
Details:
Minecraft Version: 1.7.10
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.7.0_75, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 809114560 bytes (771 MB) / 2517106688 bytes (2400 MB) up to 7635730432 bytes (7282 MB)
JVM Flags: 3 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx8192m -XX:MaxPermSize=256m
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
IntCache: cache: 0, tcache: 0, allocated: 12, tallocated: 96
FML: MCP v9.05 FML v7.10.85.1291 Minecraft Forge 10.13.2.1291 Optifine OptiFine_1.7.10_HD_B4 40 mods loaded, 40 mods active
mcp{9.05} Minecraft Coder Pack Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
FML{7.10.85.1291} Forge Mod Loader Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Forge{10.13.2.1291} Minecraft Forge Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
CodeChickenCore{1.0.4.35} CodeChicken Core Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MobiusCore{1.2.3} MobiusCore Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
NotEnoughItems{1.0.4.83} Not Enough Items Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
PlayerAPI{1.2} Player API Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
SmartCore{1.0} Smart Core Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
bspkrsCore{6.15} bspkrsCore Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Treecapitator{1.7.10} Treecapitator Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Backpack{2.0.1} Backpack Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BetterFoliage{1.0.4} Better Foliage Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BuildCraft|Core{6.4.2} BuildCraft Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BuildCraft|Transport{6.4.2} BC Transport Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BuildCraft|Silicon{6.4.2} BC Silicon Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BuildCraft|Builders{6.4.2} BC Builders Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BuildCraft|Energy{6.4.2} BC Energy Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BuildCraft|Factory{6.4.2} BC Factory Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
ForgeMultipart{1.1.1.320} Forge Multipart Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
chisel{2.3.7.34} Chisel 2 Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
customnpcs{1.7.10} CustomNpcs Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
DamageIndicatorsMod{3.2.0} Damage Indicators Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
flansmod{4.7.0} Flan's Mod Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
inventorytweaks{1.58-147-645ca10} [Inventory Tweaks](InventoryTweaks-1.58-147 -.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
IronChest{6.0.62.742} Iron Chest Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Waila{1.5.8} Waila Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
JABBA{1.1.4} JABBA Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
aapijc{1.2.4-JC} JCAnimationAPI Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
jurassicraft{1.3.2-daily_build-2015_01_15} JurassiCraft Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Mekanism{8.0.1} Mekanism Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MekanismGenerators{8.0.1} MekanismGenerators Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MekanismTools{8.0.1} MekanismTools Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
morechisels{@Version@} More Chisels Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MapWriter{2.1.1} MapWriter Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Opis{1.2.3} Opis Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
simplerecipes{1.7.2a} Pam's Simple Recipes Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
SmartMoving{15.1} Smart Moving Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
SmartRender{2.0} Smart Render Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
McMultipart{1.1.1.320} Minecraft Multipart Plugin Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
ForgeMicroblock{1.1.1.320} Forge Microblocks Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Profiler Position: N/A (disabled)
Vec3 Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Player Count: 1 / 8; [EntityPlayerMP['Coca_Spartan'/563, l='Dino Land 3', x=255.18, y=51.00, z=-241.12]]
Type: Integrated Server (map_client.txt)
Is Modded: Definitely; Client brand changed to 'fml,forge'

Fixed!