local state = {}
local angle = {}
local depth = {}
local delay = {}

--how far the sub will sink into the ground
local max_depth = 100
--how far the sub will turn
local max_angle = 40

function sinking_sub_init(e)

angle[e] = 0
depth[e] = 0
state[e] = "init"
delay[e] = 100

end

function sinking_sub_main(e)

if state[e] == "init" then
if g_Entity[e]['health'] < 1 then
state[e] = "hit"
end

elseif state[e] == "hit" then
if GetTimer(e) > delay[e] then
delay[e] = GetTimer(e) + 100
CollisionOff(e)
if angle[e] < max_angle then
angle[e] = angle[e] + 1
RotateZ(e,angle[e])
if depth[e] < max_depth / 2 then
depth[e] = depth[e] + 1
MoveUp(e,-depth[e])
end
elseif depth[e] < max_depth then
depth[e] = depth[e] + 1
MoveUp(e,-depth[e])
else
CollisionOn(e)
end

end
end

end --main

-- script by Avram, adapted by Old Larry for ally helicopter that has drop you near the enemies' zone then it returns to base
-- save as heligoing.lua
-- the entity (helicopter) must be set as this: always active = YES, physics = NO

planes = planes or {}
SndPlaying = SndPlaying or {}
--local maxvolume = 80
--local minvolume = 0
--local noise = 0
       
function heligoing_main(e)
planes[e] = planes[e] or {} --initialize plane (helicopter) data
    planes[e]['speed'] = planes[e]['speed'] or 150 + math.random(150,200) -- set helicopter speed (100-200)or greater
    planes[e]['turnspeed'] = planes[e]['turnspeed'] or 150 -- set turning speed
    planes[e]['fallspeed'] = planes[e]['fallspeed'] or 150 -- set falling speed
    planes[e]['takeoffspeed'] = planes[e]['takeoffspeed'] or 150 -- set takeoff speed
    
    local this = aEntity:new(e, "mustang") -- initialize entity obj
    local state = this:attr("state") or "init" -- get current state [defaults to "init"]
    local timer = aTimer:new(e) -- initialize timer
    local dist = aPlayer:distance(this)
    this:watch_death()
    
      -- taking off
     if state=="takeoff" then
        timer:start() -- start timer
        GravityOff(e) -- turn off gravity
        if timer:between(0,2) then
            MoveUp(e, planes[e]['takeoffspeed'] - (planes[e]['takeoffspeed'] * 0.3) ) -- start slower (3 secs)
            elseif timer:between(2,3) then --activate this if you want more high
            MoveUp(e, planes[e]['takeoffspeed']) -- go at takeoff speed (another 2 secs)
        elseif timer:greater(3) then
            if (g_Entity[e]['y'] <= g_PlayerPosY+200) then -- pull nose up and increase height (takeoff) while below player
                --SendMessageF("setrotationx",e,-5);
                SendMessageF("setpositiony",e,g_Entity[e]['y']+6)
            else -- push nose down and set state to fly when above player, also stop the timer
                SendMessageF("setrotationx",e,0);
                state = "fly"
                timer:stop()
            end
            MoveForward(e, planes[e]['takeoffspeed'] + (planes[e]['takeoffspeed'] * 0.5)) -- move at increased speed while taking off
        end
 
    end   
     

    -- flying straight
      if state=="fly" then
        MoveForward(e, planes[e]['speed']) -- move at defined speed
 
        if (math.random(1, 2) == 2) then -- in 10% cases rotate plane a bit and change it's height
            RotateX(e, math.random(-1, 1))
            RotateZ(e, math.random(-1, 1))
            SendMessageF("setpositiony",e,g_Entity[e]['y']+math.random(-1, 1));
     end
end   
     
         -- initialization
    if state=="init" then
        GravityOff(e) -- turn gravity off
        state = "takeoff" -- take off
    end
 
    -- if too far from the player, set to continuing fly state
    if state=="fly" and dist > 5000 then
        state = "fly"
    end
     
       if state=="fly" and dist >= 600 then --you can change it to desiderd start sound distance 
        LoopSound(e, 0)
        SetSoundVolume(80)
    end
    if state=="fly" and dist >= 6000 then
        state = "fall"
        StopSound(e, 0)
        Destroy(e)
        ActivateIfUsed(e)
    end
       this:attr('state', state) -- store the (modified) state
end